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2D - 2-Dimensional 3ACC - 3A Central Control 3D - 3-Dimensional 3M - Minnesota Mining and Manufacturing 4GL - Fourth Generation Language 4H - Head, Heart, Hands, Health 5XBCOER - 5 X-Bar Central Office Equipment Reports system, "5XB COER"


A - Aftermath AA - Administrative Assistant AA - Affirmative Action committee AA - Alcoholics Anonymous AA - American Airlines AA - Antiaircraft Artillery AA - Associate in Accounting AA - Astronomy and Astrophysics, "A&A" AA - Automobile Association (in England) AAA - American Automobile Association AAA - Anti-Aircraft Artillery AAAAAA - Association for the Abolition of Abused Abbreviations and Asinine Acronyms AAAL - American Academy of Arts and Letters AAAS - American Association for the Advancement of Science AAII - American Association of Individual Investors AAMSI - American Association for Medical Systems Informatics AAO - Anglo-Australian Observatory AAP - Affirmative Action Program AARC - Anglo-American Cataloging Rules AARP - Appletalk ARP AAS - American Astronomical Society AAVSO - American Association of Variable Star Observers AAX - Automated Attendant eXchange AB - Able Bodied seaman ABA - American Bar Association ABA - American Basketball Association ABA - American Booksellers Association ABATS - Automatic Bit Access Test System ABBR - ABBReviation ABC - American Broadcasting Company ABEL - Advanced Boolean Expression Language (a Data-I/O Trademark) ABHC - Average Busy Hour Calls ABI - American Bell Inc ABI - Application Binary Interface (SunOS and SV application sw interface std) ABM - Asynchronous Balanced Mode ABS - Acrylonitrile Butadiene-Styrene (plastic) ABS - Alternative Billing Service ABS - American Bureau of Shipping ABSBH - Average Busy Season Busy Hour AC - Access Control AC - Adaptive Control AC - Alternating Current (ac, see also DC) AC - Answer Center (Sun) AC - Ante Christum (before Christ) AC - Ante Cibum (before meals) ACAA - Agricultural Conservation and Adjustment Administration ACAWS - Advisory, Caution, And Warning System ACB - Annoyance Call Bureau ACBL - American Contract Bridge League ACC - Argonne Code Center ACC - Audio Communications Controller ACCRA - American Chamber of Commerce Research Association ACCS - Army Command and Control System ACCS - Automated Calling Card Service ACCT - Account ACD - Automatic Call Distributor [telephony] ACDA - Automatic Call Disposition Analyzer ACE - Advanced Composition Explorer ACE - Advanced Computing Environments [Corporate name] ACE - Automatic Calibration and Equalization ACE - Automatic Calling Equipment ACF - Advanced Communications Functions ACH - Attempt per Circuit per Hour ACHEFT - Automated ClearingHouse Electronic Funds Transfer ACK - ACKnowledge ACK - Amsterdam Compiler Kit ACL - Access Control List ACL - Advanced Cmos Logic ACLU - American Civil Liberties Union ACM - Access Control Machine ACM - Association for Computing Machinery ACO - Acronym Control Officer ACOF - Attendant Control Of Facilities ACP - ACtion Point ACRNEMA - a medical imaging standard, "ACR/NEMA" ACRV - Assured Crew Return Vehicle (or) Astronaut Crew Rescue Vehicle ACS - Advanced Communications System ACS - Australian Computer Science ACSE - Association Control Service Entity (ISO/CCITT layer 7) ACSNET - Acedemic Computing Services NETwork ACSU - Advanced t-1 Channel Service Unit ACTPU - ACTivate Physical Unit (SNA) ACTS - Advanced Communications Technology Satellite ACTS - Automated Coin Toll Service ACTS - Automatic Coin Telephone Service [telephony] ACTUP - AIDS Coalition To Unleash Power, "ACT UP" ACU - Alarm Control Unit ACU - Automatic Calling Unit ACW - Alternating Continuous Waves ACWP - Actual Cost of Work Performed AD - Addendum AD - After Date AD - Analog to Digital converter, "A/D" (see ADC) AD - Anno Domini (in the year of our Lord) AD - Application Development ADA - Air Defense Artillery ADB - A DeBugger ADB - Apple Desktop Bus ADC - Analog to Digital Converter ADCCP - Advanced Data Communications Control Procedure ADCI - Automatic Display Call Indicator ADD - Advanced Dungeons & Dragons, "AD&D" ADDCP - Advanced Data Communication Control Procedure ADEW - Andrew Development Environment Workbench ADF - Automatic Direction Finder ADFRF - Ames-Dryden Flight Research Facility (was DFRF) (NASA) ADI - Anolog Device Inc ADM - ADMiral ADM - Additional Dealer Markup ADM - Advanced Micro Devices ADMD - Administration Management Domain
ADN - Abbreviated Dialing Number
ADP - Adenosine Di-Phosphate
ADP - Administrative Data Processing
ADP - Advanced Data Processing
ADP - Automatic Data Processing
ADPCM - Pulse Code Modulation with Adaptive Quantization
ADS - Advanced Digital System
ADS - Application Development System
ADS - Audio Distribution System
ADS - Automatic Voice System
ADS - Auxilary Data System
ADSP - AppleTalk Data Stream Protocol
ADSR - Attack Decay Sustain Release
ADT - Abstract Data Type
ADT - Atlantic Daylight Time
AE - Application Entity/Environment/Execution/Engineering (APE)
AEA - American Electronics Association
AEA - Atomic Energy Authority
AEC - Architectural Engineering Construction
AEC - Atomic Energy Commission
AEF - American Expeditionary Force (see BEF)
AEGIS - Advanced Electronic Guidance and Instrumentation System
AES - Application Environment Specification
AF - Address Family (sockets)
AF - Adventures in Fantasy
AF - Air Force
AF - Audio Frequency
AFACTS - Automatic FACilities Test System
AFADS - Automatic Force Adjustment Data System
AFATDS - Advanced Field Artillery Tactical Data System
AFB - Air Force Base
AFC - American Football Conference
AFC - Automatic Frequency/Flight Control
AFCAC - Air Force Computer Acquisition Center
AFCC - Air Force Communications Command
AFGE - American Federation of Government Employees
AFI - Authority and Format Identifier
AFIPS - American Federation of Information Processing Societies
AFL - American Federation of Labor
AFL - American Football League
AFLCIO - American Federation of Labor; Congress of Industrial Organizations, "AFL-CIO"
AFM - Adobe Font Metrics
AFNOR - Association Francaise de NORmalization
AFP - Appletalk Filing Protocol
AFS - Andrew File System
AFSC - Air Force Systems Command
AFSCME - American Federation of State, County and Municipal Employees
AFSK - Automatic Frequency Shift Keying
AFTRA - American Federation of Television and Radio Artists
AFUU - Association Francaise des Utilisateurs d'Unix
AG - Adjutant General
AG - Arcade Game
AG - Attorney General
AGCT - Army General Classification Test
AGL - Above Ground Level
AGM - Air-to-Ground Missile
AGN - Active Galactic Nucleus
AGU - American Geophysical Union
AH - Artificial Horizon
AH - Avalon Hill (major war game manufacturer)
AHA - American Homebrew Association
AHL - American Hockey League
AHQ - Air HeadQuarters
AI - Allegheny International
AI - Amnesty International
AI - Anal Intrusion
AI - Artificial Insemination
AI - Artificial Intelligence
AI - Attitude Indicator
AIA - American Institute of Architects
AIA - Application Integration Architecture
AIAA - American Institute of Aeronautics and Astronautics
AIC - Automatic Intercept Center
AICC - Automatic Intercept Communications Controller
AID - Agency for International Development
AIDDE - Ames' Interactive Dynamic Display Editor
AIDS - Acquired ImmunoDeficiency Syndrome
AIM - Air Interception Missile
AIM - Airman's Information Manual
AIMS - Advanced Inventory Management System
AIOD - Automatic Identification Outward Dialing
AIPS - Astronomical Image Processing System
AIS - Action Item System
AIS - Automatic Intercept System
AIX - Advanced Interactive eXecutive (unix)
AJ - Astronomical Journal
AK - Alaska
AKA - Also Known As
AL - Alabama
AL - American League (baseball)
ALA - American Library Association
ALA - Automobile Legal Association
ALAP - AppleTalk-LocalTalk Link Access Protocol
ALBM - Air-to-Land Ballistic Missile
ALBO - Automatic Line BuildOut
ALC - Automatic Load Control
ALEXIS - Array of Low Energy X-ray Imaging Sensors
ALFA - Anonima Lombarda Fabbrica Automobili
ALFE - Analog Line Front End
ALGOL - ALGOrithmic Language
ALI - Automatic Location Indentification
ALIT - Automatic Line Insulation Testing
ALM - Asychronous Line Module
ALM - Asynchronous Line Multiplexer
ALPO - Association of Lunar and Planetary Observers
ALRU - Automatic Line Record Update
ALS - Advanced Launch System [Space]
ALS - Automated List Service
ALU - Arithmetic Logic Unit
AM - Administrative Module
AM - Agricultural and Mechanical, "A&M"
AM - Air Marshal
AM - Alpes-Maritimes, "A.-M."
AM - American, "Am."
AM - Americium, "Am"
AM - Amplitude Modulation
AM - Ante Meridiem, "a.m." (before noon)
AM - anno mundi (in the year of the world)
AMA - American Medical Association
AMA - Association for Model Aviation
AMA - Automatic Message Accounting
AMACS - Automatic Message Accounting Collection System
AMARC - Automatic Message Accounting Recording Center
AMASE - Automatic Message Accounting Standard Entry
AMAT - Automatic Message Accounting Transmitter
AMATPS - Automatic Message Accounting TeleProcessing System
AMBA - Association of Master of Business Administration
AMC - Albany Medical College
AMD - Advanced Micro Devices [Corporate name]
AMERITECH - AMERican Information TECHnologies
AMEX - AMerican EXpress
AMI - American Micro System Inc
AMORC - Ancient Mystic Order Rosae Crucis
AMP - Adenosine MonoPhosphate
AMPAS - Academy of Motion Picture Arts and Sciences
AMPS - Advanced Mobile Phone Service
AMRAAM - Advanced Medium Range Air-To-Air Missile
AMROC - American Rocket Company [Space]
AMSAT - radio AMateur SATellite corp.
AMT - Active Memory Technology
AMU - Atomic Mass Unit
AMVET - AMerican VETeran
AN - Associated Number
ANA - American Nurses Association
ANA - Automatic Number Announcement
ANAC - Automatic Number Announcement Circuit [telephony]
ANC - All Number Calling [telephony]
ANC - American Network Communications
ANC - Army Nurse Corps
ANDF - Architecture-Neutral Distribution Format
ANF - Automatic Number Forwarding
ANG - Air National Guard
ANI - Automatic Number Identification [telephony]
ANIF - Automatic Number Identification Failure
ANL - Argonne National Laboratory
ANOVA - ANalysis Of VAriance
ANPA - American Newspaper Publishers Association
ANSI - American National Standards Institute
ANU - Australian National University
ANZUS - Australia, New Zealand, United States
AO - Account Of
AOA - Abort Once Around (Shuttle abort plan)
AOCS - Attitude and Orbit Control System
AOL - Absent Over Leave (see AWOL)
AOP - Annual Operating Plan
AOPA - Aircraft Owners and Pilots Association
AOQ - Average Outgoing Quality
AOS - Academic Operating System
AOS - Alternate Operator Service [telephony]
AOSS - Auxilliary Operator Service System
AOW - Asia and Oceania Workshop
AP - Accounts Payable, "A/P"
AP - Additional Premium
AP - All Points
AP - Application Process
AP - Associated Press
AP - Attached Processor
APA - All Points Addressable
APB - All Points Bulletin
APC - AMARC Protocol Converter
APDA - Apple Programmers and Developers Association
APDU - Application Protocol Data Unit
APE - APplication Engineering
APG - Aberdeen Proving Ground
API - American Petroleum Institute
API - Application Program Interface
API - Application Programming Interface
APICS - American Production and Inventory Control Society
APJ - Astrophysical Journal, "Ap.J", "ApJ"
APM - Attached Pressurized Module (a.k.a. Columbus)
APO - Alpha Pi (?) Omega, service fraternity
APO - Army Post Office
APP - Application Portability Profile
APPC - Advanced Peer-to-Peer Communications
APPC - Advanced Program-to-Program Communication (IBM)
APR - Annual Percentage Rate
APS - Automatic Protection Switch
APSE - Ada Programming Support Environment
APU - Auxiliary Power Unit
AQ - Accumulator-Quotient register
AQL - Acceptable Quality Level
AR - Accounts Receivable, "A/R"
AR - Address Register
AR - Alarm Report
AR - Arkansas
ARAMIS - American Rheumatic Arthritis Medical Information System
ARC - American Red Cross
ARC - Ames Research Center (NASA)
ARC - Audio Response Controller
ARCNET - Attached Resource Computer local area NETwork
ARCO - Atlantic Richfield COmpany
ARIS - Audichron Recorded Information System
ARM - Acorn Risc Machine
ARM - Adjustable Rate Mortgage
ARM - Annotated Reference Manual
ARO - After Receipt of Order
ARP - Address Resolution Protocol (Internet->Ethernet)
ARPA - Advanced Research Projects Agency (of the DoD, see DARPA)
ARPANET - Advanced Research Projects Agency NETwork
ARQ - Automatic Repeat reQuest
ARRL - Amateur Radio Relay League
ARS - Alternate Route Selection
ARSA - Airport Radar Service Area
ARSB - Automated Repair Service Bureau
ARTCC - Air Route Traffic Control Center
ARTEMIS - Advanced Relay TEchnology MISsion
ARU - Audio Response Unit
ARV - American Revised Version
AS - Anglo-Saxon
ASA - Acetyl Salicylic Acid
ASA - American Standards Association (now ANSI)
ASA - Astronomical Society of the Atlantic
ASAIGAC - As Soon As I Get A Chance
ASAP - As Soon As Possible
ASC - Accredited Standards Committee
ASC - Additional Sense Code
ASCAP - American Society of Composers, Authors, and Publishers
ASCC - Automatic Sequence-Controlled Calculator
ASCII - American Standard Code for Information Interchange
ASCQ - Additional Sense Code Qualifier
ASDIC - Anti-Submarine Detection Investigation Committee (British for sonar)
ASDSP - Application-Specific Digital Signal Processor
ASG - Automated Sciences Group
ASHRAE - Amer. Soc. of Heating, Refrigerating and Air-cond. Engineers, inc.
ASI - Agenzia Spaziale Italiano
ASI - Asynchronous SCSI Interface
ASI - Automatic System Installation
ASIC - Application Specific Integrated Circuit
ASK - Amplitude Shift Keying
ASM - American Society of Metals
ASME - American Society of Mechanical Engineers
ASN - Abstract Syntax Notation
ASN1 - Abstract Syntax Notation One, "ASN.1"
ASOC - Administrative Service Oversight Center
ASP - Aggregated Switch Procurement
ASP - Appletalk Session Protocol
ASPEN - Automatic System for Performance Evaluation of the Network
ASR - Airport Surveillance Radar
ASRM - Advanced Solid Rocket Motor
ASRS - Aviation Safety Reporting System
ASSR - Autonomous Soviet Socialist Republic
AST - Applied System Technology
AST - Asyncronous System Trap
AST - Atlantic Standard Time
ASTM - American Society of Testing and Materials
ASV - American Standard Version
AT - Access Tandem
AT - Atlantic Time
ATA - AT Attachment
ATA - Airport Traffic Area
ATA - Automatic Trouble Analysis
ATACC - Advanced Tactical Air Command Central
ATB - Advanced Technology Bomber (stealth bomber)
ATB - All Trunks Busy
ATC - Air Traffic Control
ATC - Atsugi Technical Center
ATC - Automatic Transmission Control
ATDRS - Advanced Tracking and Data Relay Satellite
ATE - Automatic Test Equipment
ATF - Advanced Technology Fighter
ATH - Abbreviated Trouble History
ATI - Automatic Test Inhibit
ATIS - Atherton Tools Interface Specification
ATIS - Automatic Terminal Information Service
ATIS - Automatic Transmitter Identification System
ATK - Andrew ToolKit
ATLAS - Atmospheric Laboratory for Applications and Science
ATM - Adobe Type Manager
ATM - Amateur Telescope Maker
ATM - Automatic Teller Machine
ATM - Asynchronous Transfer Mode
ATMS - Automated Trunk Measurement System
ATN - Automated Test Network
ATO - Abort To Orbit (Shuttle abort plan)
ATOMS - AT&t Optimized Materials Simulator
ATP - Adenosine TriPhosphate
ATP - Airline Transport Pilot (highest grade of pilot certificate)
ATP - All Tests Pass
ATP - Appletalk Transaction Protocol
ATP2 - AppleTalk Phase 2
ATPCO - Airline Tariff Publishing COmpany
ATR - Alternate Trunk Routing
ATRS - Automated Trouble Reporting System
ATS - Automated Test System
ATT - American Telephone & Telegraph, "AT&T"
ATTC - Automatic Transmission Test and Control circuit
ATTCOM - American Telephone & Telegraph COMmunications
ATTIS - American Telephone & Telegraph Information Systems
ATV - All Terrain Vehicle
AU - Arithematic Unit
AU - Astronomical Unit (93,000,000 miles) [Space]
AUDIX - AUDio Information eXchange
AUI - Attachment Unit Interface
AUP - Acceptable Use Policy
AURA - Association of Universities for Research in Astronomy
AUS - Army of the United States
AUTODIN - AUTOmatic DIgital Network
AUTOSEVCOM - AUTOmatic SEcure Voice COMmunications
AUTOVON - AUTOmatic VOice Network
AUX - Apple UniX
AUXF - AUXillary Frame
AV - AudioVisual
AVD - Alternate Voice Data
AVLIS - Atomic Vapor Laser Isotope Separation
AWACS - Airborne Warnings And Control Systems
AWEA - American Wind Energy Association
AWG - American Wire Gauge
AWK - al Aho, peter Weinberger, brian Kernighan (pattern scanning language)
AWOL - Absent WithOut Leave (also Absent Without Official Leave) (see AOL)
AWST - Aviation Week and Space Technology (a.k.a. AvLeak), "AW&ST"
AXAF - Advanced X-ray Astrophysics Facility [Space]
AY - Arther Young
AZ - Arizona


B - Book B - Byte B - bit, "b" B6ZS - Bipolar with 6 Zero Subsitution B911 - Basic 911 BA - Bachelor of Arts BACH - Business Alliance for Commerce in Hemp BAFO - Best And Final Offer BALUN - BALanced to UNbalanced BAMAF - BELLCORE AMA Format BANCS - Bell Administrative Network Communications System BAPCO - Bellsouth Advertising & Publishing COmpany BARRNET - Bay Area Regional Research Network, "BARRNet" (SF Bay Area) BASH - Bourne-Again SHell BASIC - Beginner's All-purpose Symbolic Instruction Code BATSE - Burst And Transient Source Experiment (on GRO) BB - Bases on Balls BB - Best of Breed BB - Bunnies and Burrows BBA - Bachelor of Business Administration BBB - Better Business Bureau BBC - British Broadcasting Corporation BBL - Barrel BBN - Bolt, Beranek, and Newman [Corporate name] BBXRT - Broad-Band X-Ray Telescope (ASTRO package) BC - Battlecars BC - Before Christ BC - British Columbia BCBS - Blue Cross/Blue Shield, "BC/BS" BCC - Blind/Blank Carbon Copy BCC - Blocked Call Cleared BCC - Block Check Character BCD - Bad Conduct Discharge BCD - Binary Coded Decimal BCD - Blocked Call Delayed BCDIC - Binary Coded Decimal Interchange Code BCE - Before the Common Era (substitute for BC) BCP - Binary Communications Protocol BCP - Byte Controlled Protocols BCPL - Basic Combined Programming Language BCR - Bell Communications Research BCS - Bachelor of Commercial Science BCS - Batch Change Supplement BCS - Binary Compatibility Standard (ABI for Motorola chips) BCS - Boston Computer Society BCS - British Computer Society BCS - Basic Combined Subset BCWP - Budgeted Cost of Work Performed BCWS - Budgeted Cost of Work Scheduled BD - Bachelor of Divinity BD - Bank Draft BD - Bills Discounted BDA - Battle Damage Assessment BDA - Bomb Damage Assessment BDC - Boston Development Center BDD - Basic Dungeons & Dragons, "BD&D" BDF - Binary Distribution Format BDF - Bitmap Description Format (Adobe) BDF - Bitmap Distribution Format BDT - Billing Data Transmitter BDT - Bulk Data Transfer BE - Back End BE - Bill of Exchange BEA - Bureau of Economic Analysis BEAV - Binary Editor And Viewer BECAUSE - BEnchmark of Concurrent Architectures for their Use in Scientific Engineering BED - Hanscom Field, Bedford MA BEF - Band Elimination Filter BEF - British Expeditionary Force (see AEF) BELLCORE - BELL COmmunications REsearch BEM - Bug Eyed Monster BENELUX - BElgium, NEtherlands, and LUXembourg BER - Basic Encoding Rules BER - Bit Error Rate BERT - Bit Error Rate Test BEST - Borland Enhanced Support and Training BETRS - Basic Exchange Telecommunications Radio Service BF - Brought Forward BFA - Bachelor of Fine Arts BFD - Big F***ing Deal BFHD - Big Fat Hairy Deal BFR - Biennial Flight Review BGP - Border Gateway Protocol BH - Black Hole BH - Boot Hill BHA - Butylated HydroxyAnisole BHC - Busy Hour Calls BHP - Brake HorsePower BHT - Butylated HydroxyToluene BI - Backplane Interconnect BI - Bus Interconnect BICS - Building Industry Consulting Services [telephony] BID - Bis In Die (twice a day) BIMA - Berkeley Illinois Maryland Array BIND - Berkeley Internet Name Daemon BIOC - Break Into Other Computers BIOS - Basic Input Output System BIS - Business Information System BISDN - Broadband Integrated Services Digital Network, "B-ISDN" BISP - Business Information System Program BISYNC - Binary Synchronous Communications, "BiSync" (BSC is preferred) [IBM] BIT - Binary digIT BIT - Bipolar Integrated Technology Inc BITNET - Because-It's-Time NETwork BITS - Biotechnology Information Toolkit Software BIU - Bus Interface Unit BIX - Byte Information eXchange BL - Bill of Loading BLAS - Basic Linear Algebra Subroutines BLAST - BLocked ASynchronous Transmission BLDS - Busy Line/Don't Answer, "BL/DS"
BLER - Block Error Rate
BLERT - BLock Error Rate Test
BLF - Busy Lamp Field [telephony]
BLF - Busy Line Field
BLM - Bureau of Land Management
BLOBS - Binary Large OBjectS
BLS - Bureau of Labor Statistics
BLS - Business Listing Service
BLT - BLock Transfer
BLT - Bacon, Lettuce, and Tomato
BLV - Busy Line Verification
BM - Basal Metabolism
BM - Bowel Movement
BM - Breakdown Maintenance
BMA - Bank Marketing Association
BMEWS - Ballistic Missile Early Warning
BMG - Bloomington, IN
BMI - Broadcast Music Inc.
BMO - Ballistic Missile Office
BMOC - Big Man On Campus
BMP - Benchmark Plan
BMR - Basal Metabolism Rate
BNC - Bayonet Navy Connector
BNC - Bayonet Neill Concelman (connector) [electronics] (see also TNC)
BNC - Berkley Nucleonics Corporation
BNC - British Naval Connectors
BNET - Berkeley NETworking
BNF - Bachus-Naur Form
BNFL - British Nuclear Fuels Ltd
BNRCVUUCP - Batch News ReCeive Via UUCP
BNS - Billed Number Screening
BNSC - British National Space Centre
BNU - Basic Networking Utilities (AT&T's name for HoneyDanBer UUCP)
BO - Body Odor
BO - Branch Office
BO - Buyer's Option
BOC - Bell Operating Company
BOD - Board Of Directors
BOF - Birds Of a Feather
BOM - Bill Of Materials
BOQ - Bachelor Officers' Quarters
BOR - Basic Output Report
BORSCHT - Battery, Overvoltage, Ringing, Supervision, Coding, Hybrid Test
BOS - Boston MA
BOS - Business Office Supervisor
BOSIX - Biin Open System Interface eXtension
BOSS - Billing and Order Support System
BOT - Beginning Of Tape
BP - Blood Pressure
BP - British Petroleum
BP - British Pharmacopoeia
BPI - Bits Per Inch, Blocks Per Inch, Bytes Per Inch
BPOC - Bell Point Of Contact
BPOE - Benevolent and Protective Order of Elks
BPPS - Basing-Point Pricing System
BPS - Bits/Bytes Per Second
BPSS - Basic Packet-Switching Service
BR - Bills Receivable
BR - British Rail
BRAT - Business Residence Account Tracking system
BRC - Business Reply Card
BRCS - Business Residence Custom Service
BRI - Basic Rate Interface
BRIEF - Basic Reconfigurable Interactive Editing Facility
BRL - Ballistics Research Lab
BRL - army Ballistic Research Laboratory
BRM - Basic Remote Module
BRS - Bibliographic Retrieval Service
BS - Bachelor of Science
BS - Back Space
BS - Banded Signaling
BS - Bill of Sale
BS - Bill of Sale, "B/S"
BS - British Standards
BSA - Basic Serving Arrangements
BSA - Birmingham Small Arms
BSA - Boy Scouts of America
BSBH - Busy Season Busy Hour
BSC - Bachelor of SCience, "BSc"
BSC - Binary Synchronous Communication
BSC - Binary Synchronous Communications (also sometimes BiSync) [IBM]
BSC - Business Service Center
BSCM - BiSynchronous Communications Module
BSD - Berkeley Software Distribution
BSE - Basic Service Element
BSF - Bell Shock Force
BSI - British Standards Institute
BSMTP - Batched SMTP
BSN - Bachelor of Science in Nursing
BSOC - Bell Systems Operating Company
BSP - Bell System Practice
BSRFS - Bell System Reference Frequency Standard
BSS - Basic Synchronized Subset
BSS - Block Started by Symbol (IBM assembly-language)
BST - Basic Services Terminal
BSTJ - Bell System Technical Journal
BSW - Boston Software Works
BT - Bus Terminator
BTAM - Basic Telecommunications Access Method [IBM]
BTHU - British Thermal Unit, "BThU" (BTU, q.v., is preferred)
BTL - Backplane Transceiver Logic
BTL - Bell Telephone Laboratories
BTN - Billing Telephone Number
BTO - Bachman Turner Overdrive
BTOL - Better Than Open Look
BTS - Board Tracking System
BTU - British Thermal Unit
BTW - By The Way [net jargon]
BU - Bushido
BU - Business Units
BURP - Brewers United for Real Potables
BUS - Basic Utility System
BUT - Board Under Test
BV - Blessed Virgin
BVA - Billing Validation Application
BVC - Billing Validation Center
BVY - Beverly MA
BW - Business Wire
BWC - BandWidth Compression
BWI - Baltimore-Washington International (airport)
BWI - British West Indies
BWM - Broadcast Warning Message
BWT - Broadcast Warning TWX
BWTS - BandWidth Test Set
BX - Base eXchange (see also PX)
BYU - Brigham Young University


C - Copper C - programming language, successor to BCPL CA - CAble CA - California CA - Chartered Accountant CA - Chief Accountant CA - Chronological Age CA - Collision Avoidance (as in CSMA/CA (q.v.)) CAA - Civil Aviation Authority (U.K.) CAB - Civil Aeronautics Board CABS - Carrier Access Billing System CAC - Calling-card Authorization Center CAC - Carrier Access Code CAC - Circuit Administration Center CAC - Customer Administration Center CACM - Communications of the Association for Computing Machinery CAD - Computer Aided Design (sometimes seen as CAD/CAM) CAD - Computer-Aided Dispatch CADD - Computer-Aided Design and Drafting CADV - Combined Alternate Data/Voice CAE - Common Application Environment CAE - Computer-Aided Education CAE - Computer-Aided Engineering CAFE - Corporate Average Fuel Economy CAGR - Compound Annual Growth Rate CAI - Call Assembly Index CAI - Computer Aided Instruction CAI - Computer Application Inc CAI - Computer Assisted Instruction CAIS - Colocated Automatic Intercept System CAIS - Common Apse Interface Specification CALRS - Centralized Automatic Loop Reporting System CALS - Computer-aided Acquisition and Logistics Support CAM - Common Access Method (SCSI) CAM - Computer Aided Management CAM - Computer Aided Manufacturing (sometimes seen as CAD/CAM) CAM - Computer-Aided Manufacturing CAM - Content Addressable Memory CAMA - Centralized Automatic Message Accounting CAMAC - Computer Automated Measurement And Control CAMM - Computer Assisted Material Management CAMM - Content and Media Management CAMP - Campaign Against Marijuana Planting CAMRA - CAMpaign for Real Ale CAN - Campus Area Network CAP - Civil Air Patrol CAP - Columbia Appletalk Package CAP - Computer Aided Publishing CAPP - Computer Aided Process Planning CAPTAIN - Character And Pattern Telephone Access Information Network CAR - Computer Access & Retrieval CAR - Contents of the Address part of the Register CAROT - Centralized Automatic Reporting On Trunks CART - Championship Auto Racing Teams CAS - Circuit Associated Signaling CAS - Communicating Application Specification CAS - Computerized Autodial System CASE - Common Application Service Element CASE - Computer Aided Software Engineering CASSIS - Classification and Search Support Information System CAT - Computer Assisted Typesetter CAT - Computer-Aided Tomography CAT - Craft Access Terminal CAT - Customer Acceptance Test CAT - conCATenate CATIS - Common Applications and Tools Integration Services CATLAS - Centralized Automatic Trouble Locating and Analysis System CATV - Community Antenna TeleVision CAU - Connection Arrangement Unit CAV - Constant Angular Velocity CAVU - Ceiling And Visibility Unlimited CB - Citizens Band radio CBC - Canadian Broadcasting Corporation CBD - Cash Before Delivery CBD - Central Business District CBD - Commerce Business Daily CBDS - Connectionless Broadband Data Service CBEMA - Computer & Business Equipment Manufacturers Association CBI - Computer Based Instruction CBR - Chemical, Biological, Radiological warfare CBS - Columbia Broadcasting System CBS - CrossBar Switching CBW - Chemical and Biological Warfare CBX - Computerized Branch eXchange CC - Carbon Copy CC - Center Conductor CC - Central Control CC - Common Control CC - Cost Center CC - Country Code CC - C Compiler CC - Cluster Controller CCA - Computer Corporation of America [Corporate name] CCAFS - Cape Canaveral Air Force Station CCC - Canadian Committee on Cataloging CCC - Central Control Complex CCC - Ceramic Chip Carriers CCC - Civil(ian) Conservation Corps CCC - Command, Control, and Communications (sometimes C^3) CCC - Computer Control Center CCC - Concourse Computer Center [MIT] CCCCM - CCC CounterMeasures (sometimes C^3CM) CCCI - Command, Control, Communications, and Intelligence
CCD - Charge Coupled Device (see CID)
CCD - Computer-Controlled Display
CCDS - Centers for the Commercial Development of Space
CCH - Connections per Circuit per Hour
CCI - Computer Carrier Interrupt
CCI - Computer Consoles, Incorporated
CCIM - Certified Commercial Investment Member
CCIP - Continuously Computed Impact Point
CCIR - Comite' Consultatif International des Radio Communications
CCIS - Common Channel Interoffice Signaling [telephony]
CCITT - Comite' Consultatif International Telegraphique et Telephonique
CCITT - International Consultative Committee for Telegraphy and Telephony
CCL - Console Command Language
CCNC - Common Channel Network Controller
CCNC - Computer/Communications Network Center
CCR - Commitment, Concurrency, and Recovery
CCR - Covenants, Conditions, and Restrictions
CCR - Creedence Clearwater Revival
CCR - Customer-Controlled Reconfiguration
CCRP - Continuously Computed Release Point
CCS - Common Channel Signaling
CCS - Common Command Set (SCSI)
CCS - Hundred (C) Call Seconds
CCSA - Common Control Switching Arrangement [telephony]
CCT - Central Control Terminal
CCTA - Central Computer and Telecommunications Agency
CCTAC - Computer Communications Trouble Analysis Center
CCTV - Closed Circuit TeleVision
CCU - COLT Computer Unit
CCV - Calling Card Validation
CCW - Counter ClockWise
CD - Carrier Detect (properly DCD (q.v.))
CD - Certificate of Deposit
CD - Civil Defense
CD - Collision Detection (as in CSMA/CD (q.v.))
CD - Compact Disk
CDA - Call Data Accumulator
CDA - Coin Detection and Announcement
CDA - Compound Documents Architecture
CDAR - Customer Dialed Account Recording
CDB - Command Descriptor Block
CDB - Customer Distributed Buglist
CDC - Centers for Disease Control
CDC - Control Data Corporation, inc. [Corporate name]
CDCF - Cumulative Discounted Cash Flow
CDEV - Control panel DEVice
CDF - Combined Distributing Frame
CDF - Context-Dependent File
CDI - Circle Digit Identification
CDI - Course Deviation Indicator
CDIAC - Carbon Dioxide Information Analysis Center
CDO - Community Dial Office
CDP - Career Development Program
CDPR - Customer Dial Pulse Receiver
CDR - Call Dial Rerouting
CDR - CommanDeR
CDR - Contents of the Decrement part of the Register
CDR - Critical Design Review
CDROM - Compact Disk Read Only Memory, "CD-ROM"
CDS - Craft Dispatch System
CDSF - Commercially Developed Space Facility
CDT - Call Data Transmitter
CDT - Central Daylight Time
CDU - Control Display Unit
CE - Chemical Engineer
CE - Civil Engineer
CE - Common Era (substitute for AD)
CE - Corps of Engineers
CE - Customer Engineer
CEA - Commissariat a l'Energie Atomique, France
CEA - Council of Economic Advisors
CEA - County Education Authority
CEC - Commission of the European Communities
CED - Committee for Economic Development
CEERT - Coalition for Energy Efficiency and Renewable Technologies
CEF - Cable Entrance Facility
CEI - Comparably Efficient Interconnection
CELSS - Controlled Ecological Life Support System [Space]
CEN - Centre d'Etudes Nucleaires
CENS - Centre d'Etudes Nucleaires de Seclay
CENTO - CENtral Treaty Organization
CEO - Chief Executive Officer
CERMET - Ceramic Metal Element
CERN - organisation (formerly Conseil) Europeenne pour la Recherche Nucleaires
CERT - Computer Emergency Response Team
CET - Central European Time
CEV - Controlled Environment Vault
CEVI - Common Equipment Voltage Indicator
CF - Carry Forward
CF - Coin First payphone [telephony]
CFA - Center For Astrophysics
CFB - Color Frame Buffer
CFC - Chloro-FluoroCarbon [chemical]
CFC - Combined Federal Campaign
CFCA - Communications Fraud Control Association
CFD - Computational Fluid Dynamics
CFF - Columbus Free Flyer
CFHT - Canada-France-Hawaii Telescope
CFI - Certificated Flight Instructor
CFI - Cost, Freight, and Insurance
CFL - Canadian Football League
CFO - Chief Financial Officer
CFP - Call For Papers
CFR - Code of Federal Regulations
CG - Coast Guard
CG - Commanding General
CGA - Color Graphics Adapter
CGCT - Compagnie Generale de Constructions Telephoniques
CGE - Cincinnati Gas & Electric, "CG&E"
CGE - Compagnie Generale d'Electricite
CGI - Computer Graphics Interface
CGIAR - Consultative Group on International Agricultural Research
CGM - Computer Graphics Metafile
CGN - Concentrator Group Number
CGS - Centimeter-Gram-Second
CGX - Chicago (Meigs) IL
CH - Cardboard Heroes
CH - ClearingHouse
CH - CourtHouse
CH - Customs House
CHA - Champions
CHAP - CHAnnel Processor
CHARA - Center for High Angular Resolution Astronomy
CHARGEN - CHARacter GENerator
CHI - Chill: Adventures into the Unknown
CHOTS - Corporate Headquarters Office Technology System
CHP - California Highway Patrol
CI - Cubic Inches
CIA - Central Intelligence Agency [US Government]
CIAC - Computer Incident Advisory Capability
CIB - Console Interface Board
CIC - Carrier Identification Code
CIC - Coordination and Information Center [CSNet]
CICA - Competition in Contracting Act
CICS - Customer Information Control System [IBM]
CICSVS - Customer Information Control System / Virtual Storage, "CICS/VS"
CID - Central Institute for the Deaf
CID - Charge Injection Device (see CCD)
CID - Computer Integrated Design
CIDIN - Common Icao Data Interchange Network
CIF - Caltech Intermediate Form
CIF - Cost, Insurance and Freight
CII - Call Identity Index
CIM - Computer Integrated Manufacturing
CIMA - Construction Industry Manufacture's Association
CIO - Chief Information Officer
CIP - Chief Income Producer
CIRCA - Center for Instructional and Research Computing Activities
CIRRIS - Cryogenic InfraRed Radiance Instrument for Shuttle
CIS - Chief Income Spender
CIS - Commonwealth of Independent States
CIS - Compuserve Information S?
CIS - Customized Intercept Service
CISC - Complex Instruction Set Computer
CIT - California Institute of Technology
CIT - Case Institute of Technology (part of CWRU, Cleveland, OH)
CIT - Circumstellar Imaging Telescope [Space]
CIT - Computer Integrated Telephony
CIU - Computer Interface Unit
CL - Connection-Less mode
CLASP - Comprehensive Logistics Automated Support Program
CLASS - Centralized Local Area Selective Signaling
CLASS - Custom Local Area Signaling Service
CLDN - Calling Line Directory Number
CLEF - Certified Licensed Evaluation Facility
CLEI - Common-Language Equipment Identification
CLI - Calling Line Ident
CLI - Command Line Interpreter
CLID - Calling Line IDentification
CLLI - Common-Language Location Identification
CLNP - ConnectionLess Network Protocol
CLOS - Common Lisp Object System
CLR - Combined Line and Recording
CLRC - Circuit Layout Record Card
CLS - connectionless server
CLTP - Connectionless Transport Protocol
CLU - Chartered Life Underwriter
CLUT - Color LookUp Table
CLV - Constant Linear Velocity
CM - Command Module (Apollo spacecraft)
CM - Congregation of the Mission
CM - Corrective Maintenance
CMA - Cash Management Account
CMAC - Centralized Maintenance and Administration Center
CMC - Communication Machinery Corporation
CMC - Construction Maintenance Center
CMC - Corporate Management Commitee
CMCC - Central Mission Control Centre (ESA)
CMD - Centralized Message Distribution
CMDF - Combined Main Distributing Frame
CMDS - Centralized Message Data System
CMH - Port Columbus OH
CMI - Champaign-Urbana IL
CMIP - Common Management Information Protocol
CMIS - Common Management Information Service
CMISE - Common Management Information Service Element
CML - Current Model Logic
CMMU - Cache/Memory Management Unit
CMOS - Complimentary-symmetry Metal-Oxide Semiconductor
CMOT - Common Management Information Services and Protocol over TCP/IP
CMRR - Common Mode Rejection Ratio
CMS - Call Management System
CMS - Circuit Maintenance System
CMS - Communications Management Subsystem
CMS - Conversational Monitoring System
CMSGT - Chief Master Sergeant, "CMSgt"
CMT - Cellular Mobile Telephone
CMU - COLT Measurement Unit
CMU - Carnegie-Mellon University
CMW - Compartmented Mode Workstation
CMYK - Cyan, Magenta, Yellow, blacK
CN - Canadian National (railroad) [Corporate name]
CN - Change Notice
CNA - Communications Network Application
CNA - Customer Name / Address, "CN/A" [telephony]
CNA - Customer Name and Address
CNAB - Customer Name/Address Bureau
CNC - Computer Numerical Control
CNCC - Customer Network Control Center
CNES - Centre National d'Etude Spatiales
CNI - Common Network Interface
CNM - Communications Network Management
CNMS - Cylink Network Management System
CNN - Cable News Network
CNO - Carbon-Nitrogen-Oxygen
CNO - Chief of Naval Operations
CNR - Canadian National Railways
CNR - Carrier to Noise Ratio
CNR - Consiglio Nazionale delle Ricerche, Italy
CNRCVUUCP - Compressed News ReCeive Via UUCP
CNS - Central Nervous System
CNS - Complimentary Network Service
CNSR - Comet Nucleus Sample Return
CO - Cash Order
CO - Central Office [telephony]
CO - Colorado
CO - Commanding Officer
CO - Conscientious Objector
CO - in Care Of, "C/O"
COAM - Customer Owned And Maintained
COB - Close Of Business
COBE - COsmic Background Explorer
COBOL - COmmon Business Oriented Language
COC - Call of Cthulhu
COC - Circuit Order Control
COCOM - Coordinating Comittee for Export to Comminist Area
COCOT - Customer-Owned Coin-Operated Telephone [telephony]
COD - Collect On Delivery; Cash On Delivery
CODASYL - Conference On DAta SYstems Languages
CODCF - Central Office Data Connecting Facility
CODEC - COder-DECoder
COE - Center Of Excellence
COE - Central Office Equipment
COEES - COE Engineering System
COER - Central Office Equipment Report
COFF - Common Object File Format
COLA - Cost-Of-Living Allowance
COLT - Central Office Line Tester
COM - Commercial (pilot certificate)
COM - Computer Output Microfilm
COMAS - Central Office Maintenance and Administration System
COMDEX - COMputer Dealer's Exposition
COMM - Communications
COMPACT - COMmercial Product ACquisition Team
COMPTEL - COMPton TELescope (on GRO)
COMS - Complementary Metal Oxide Semiconductor
COMSAT - COMmunications SATellite [Space]
COMSAT - Communications Satellite Corp
CONN - CONNector
CONS - Connection-Oriented Networking Session
CONTAC - Central Office NeTwork ACcess
CONUS - CONtinental United States
COO - Chief Operating Officer
COP - Character-Oriented Protocol
COPS - Computer Oracle and Password System
COQ - Cost Of Quality
CORE - COntrolled Requirement Expression
CORN - COmputer Resource Nucleus
CORNET - CORperate NETwork
COS - Central Office Switch
COS - Corporation for Open Systems
COSINE - Cooperation for Open Systems Interconnection Networking in Europe
COSMIC - COmmon Systems Main InterConnection frame system
COSMIC - COmputer Software Management and Information Center
COSMOS - COmputer System for Mainframe OperationS
COSTAR - Corrective Optics Space Telescope Axial Replacement
COT - Central Office Terminal
COTS - Connection-Oriented Transport (layer) Service
CP - Canadian Pacific
CP - Canadian Press
CP - Chemically Pure
CP - CoPy
CP - Command Post
CP - Command Processor
CP - Control Program
CPA - Certified Public Accountant
CPA - Communications & Public Affairs, "C&PA"
CPC - Cellular Phone Company
CPC - Circuit Provisioning Center
CPD - Central Pulse Distributor
CPE - Customer Premises Equipment
CPE - Customer-Provided Equipment
CPFF - Cost Plus Fixed Fee
CPH - Cost Per Hour
CPI - Characters Per Inch
CPI - Common Programming Interface
CPI - Computer Private branch exchange Interface
CPIO - CoPy In/Out
CPL - Combined Programming Language
CPM - Control Program for Microcomputers (sometimes CP/M)
CPM - Cost Per Minute
CPM - Critical Path Method
CPMP - Carrier Performance Measurement Plan
CPO - Chief Petty Officer
CPO - Chief Post Office
CPO - Customer Premises Equipment
CPP - Cable Patch Panel
CPR - Canadian Pacific Railway
CPS - Characters Per Second
CPSR - Computer Professionals for Social Responsibility
CPT - CaPTain
CPU - Central Processing Unit
CPW - Certified Public Weigher
CQ - Charge of Quarters, Call to Quarter
CQ - Commercial Quality
CR - Carriage Return (ASCII 15 octal)
CRAF - Comet Rendezvous/Asteroid Flyby [Space]
CRAM - Card Random Access Memory
CRAS - Cable Repair Administrative System
CRB - Certified Residential Broker
CRC - Camera Ready Copy
CRC - Chemical Rubber Company
CRC - Civil Rights Commission
CRC - Customer Record Center
CRC - Cyclic Redundancy Check
CRC - Cyclical Redundancy Character
CRD - Customer Required Date
CREG - Concentrated Range Extension with Gain
CREN - Corporation for Research and Educational Networking
CRFC - Customer Return For Credit
CRFMP - Cable Repair Force Management Plan
CRI - Cray Research, Inc.
CRIN - Centre de Recherche en Informatique de Nancy
CRIS - Customer Record Information System
CRISP - Complex-Reduced Instruction Set Processor
CRL - Certificate Revocation List
CRLF - Carriage Return/Line Feed
CRONIC - Colorado Rudimentary Operating Nucleus for Intelligent Controllers (HSC OS)
CROTCH - Computerized Routine for Observing and Testing the Channel Hardware
CRRES - Combined Release / Radiation Effects Satellite
CRS - Centralized Results System
CRSAB - Centralized Repair Service Answering Bureau
CRT - Cathode Ray Tube (also generic reference to a terminal)
CRTC - Canadian Radio-television and Telecommunications Commission
CS - Chivalry & Sorcery, "C&S"
CS - Civil Servant
CS - Computer Science; Computing Science
CS - County Seat
CS - Customer Service
CSA - Canadian Standards Association
CSA - Carrier Serving Area
CSA - Client Service Agent
CSA - Confederate States of America
CSA - Customer Service Administration
CSAB - Computing Sciences Accreditation Board
CSACC - Customer Service Administration Control Center
CSACS - Centralized Status, Alarm and Control System
CSAR - Centralized System for Analysis Reporting
CSC - Cell Site Controller
CSC - Computer Sciences Corporation
CSD - Customer Service Division
CSDC - Circuit Switched Digital Capability
CSE - Common Subexpression Elimination
CSF - Critical Success Factor
CSI - Commercial Systems Integration
CSIRO - Commonwealth Scientific and Industrial Research Organization
CSIS - Canadian Security and Intelligence Service
CSL - Coin Supervising Link
CSM - Command Sergeant Major
CSM - Command and Service Module (Apollo spacecraft)
CSMA - Carrier Sense Multiple Access
CSMACA - Carrier Sense Multiple Access with Collision Avoidance, "CSMA/CA"
CSMACD - Carrier Sense Multiple Access with Collision Detection, "CSMA/CD"
CSN - Computer Systems News (magazine)
CSNET - Computer Science NETwork
CSO - Central Services Organization
CSO - Computing Services Office (UIUC)
CSOC - Consolidated Space Operations Center (at Colorado Springs)
CSP - Control Switching Point
CSPAN - Cable-Satellite Public Affairs Network, "C-SPAN"
CSR - Control and Status Register
CSRG - Computer Systems Research Group
CSRI - Computer Systems Research Institute (U Toronto)
CSRS - Civil Service Retirement System
CSS - Computer Sub-System
CSS - Customer Switching System
CST - Central Standard Time
CSTC - Consolidated Satellite Test Center (USAF)
CSU - Channel Service Unit
CT - Central Time
CT - Communications & Tracking, "C&T"
CT - Computed Tomography
CT - Connecticut
CTC - Canadian Transport Commission
CTC - Central Test Center
CTC - Centralized Traffic Control [railroad]
CTC - Chu-Itoh Techno-Science Co.
CTD - Computing and Telecommunications Division
CTERM - Command TERMinal (DECNET)
CTIO - Cerro Tololo Inter-american Observatory
CTM - Contac Trunk Module
CTMS - Carrier Transmission Measuring System
CTNE - Compania Telefonica Nacional de Espana
CTO - Call Transfer Outside
CTS - Carpal Tunnel Syndrome
CTS - Cartridge Tape Subsystem (Exabyte)
CTS - Clear To Send
CTS - Compatible Timesharing System
CTSS - {Compatible,Chameleon,Cray,Cyber} Time-Sharing System
CTT - Cartridge Tape Transport
CTTC - Cartridge Tape Transport Controller
CTTN - Cable Trunk Ticket Number
CTV - Canadian TeleVision network
CU - Close-Up
CU - Control Unit
CU - Customer Unit
CUA - Common User Access
CUCRIT - Capital Utilization CRITeria
CUL - See You Later [net jargon]
CUNBATCH - Compressed news UNBATCH
CUTK - Common Update/EQuipment system, "CU/TK"
CV - Constant Velocity
CV - Curriculum Vitae
CVCC - Controlled Vortex Combustion Chamber
CVR - Compass Voice Response
CVT - Continuous Variable Transmission
CW - Car Wars
CW - Chemical Warfare
CW - Child Welfare
CW - Churchwarden
CW - Continuous Wave
CWC - City-Wide Centrex
CWI - Centrum voor Wiskunde en Informatica (Centre for Mathematics and Computer Science)
CWO - Cash With Order
CWO - Chief Warrant Officer
CWRU - Case Western Reserve University
CXI - Common X-windows Interface
CY - Calendar Year
CYO - Catholic Youth Organization
CZ - Canal Zone
CZ - Control Zone


D - Depth DA - Days after Acceptance DA - Department of Agriculture DA - Deposit Account DA - Desk Accessory (Mac) DA - Digital to Analog converter, "D?A" DA - Directory Assistance (/C = computerized, /M = Microfilm) DA - District Attorney DA - Don't Answer DAC - Design Automation Conference DAC - Digital to Analog Converter DACCS - Digital Access Cross Connect System [telephony] DACS - Digital Access Cross-connect System [telephony] DACS - Directory Assistance Charging System DAD - Draft ADdendum DAIS - Distributed Automatic Intercept System DAMQAM - Dynamically Adaptive Multicarrier Quadrature Amplitude Modulation DAP - Data Access Protocol (DECNET) DAP - Division Advisory Panel [of NSF (q.v.) DNCRI (q.v.)] DAR - Daughters of the American Revolution DARC - Division Alarm Recording Center DARPA - Defense Advanced Research Projects Agency DARU - Distributed automatic intercept system Audio Response Unit DAS - Directory Assistance System DAS - Distributor And Scanner DASD - Direct Access Storage Device DASWDT - Distributor And Scanner-Watch Dog Timer, "DAS-WDT" DAT - Digital Audio Tape DATA - Defense Air Transport Administration DAV - Data Above Voice DAV - Disabled American Veterans DAY - Dayton OH DB - DataBase DB - DeciBels, "db" DB - Dial Box DBA - Data Base Administrator DBA - Doing Business As DBAC - Data Base Administration Center DBAS - Data Base Administration System DBF - DBase Format DBM - DataBase Manager DBME - DataBase Managment Environment DBMS - DataBase Management System (rdbms for Relational) DBRAD - Data Base Relational Application Directory DBS - Duplex Bus Selector DC - Data Cartridge DC - Direct Current, "dc" (see also AC) DC - District of Columbia DCA - Defense Communications Agency DCA - Distributed Communication Architecture DCA - Document Content Architecture DCA - Washington (National) DC DCC - Data Country Code DCC - Descriptive Cataloging Committee DCC - Digital Compact Cassette DCCO - Defense Commercial Communications Office DCCS - DisContiguous Shared Segments DCD - Data Carrier Detect (sometimes CD (q.v.)) DCE - Data Circuit-terminating Equipment DCE - Data Communications Equipment DCE - Distributed Computing Environment DCH - D Channel Handler DCI - Desktop Color Imaging DCL - DEC Control Language DCL - Digital Command Language DCLU - Digital Carrier Line Uint DCM - Digital Carrier Module DCMS - Distributed Call Measurement System DCMU - Digital Concentrator Measurement Unit DCNA - Data Communication Network Architecture DCO - Document Change Order DCP - Distributed Communications Processor DCP - Duplex Central Processor DCPR - Detailed Contuing Property Record (PICS/DCPR) DCPSK - Differential Coherent Phase-Shift Keying DCS - Digital Crosconnect System DCS - Distribution Control System DCT - Digital Carrier Trunk DCTN - Defense Commercial Telecommunications Network DCTS - Dimension Custom Telephone Service DD - Daredevils DD - Data Dictionary DD - Days after Date DD - Demand Draft DD - Dishonorable Discharge DD - Disk Drive DD - Doctor of Divinity DD - Dungeons & Dragons, "D&D" DDA - Digital Differential Analyzer DDA - Domain Defined Attribute DDB - Device Dependent Bitmap DDC - Digital Data Converter DDC - Direct Department Calling DDCMP - Digital Data Communication Message Protocol DDCU - DC-to-DC Converter Unit DDD - Direct Distance Dialing [Telephony; principally US, elsewhere STD] DDE - Dynamic Data Exchange DDJ - Dr. Dobbs Journal DDK - Driver Development Kit (from MS) DDL - Document Description Language DDN - Defense Data Network DDP - Datagram Delivery Protocol DDP - Distributed Data Processing DDPEX - Device Dependent PEX DDS - Dataphone Digital Service [AT&T] DDS - Digital Data Service
DDS - Digital Data Storage (Sony and HP's DAT format)
DDS - Digital Data System
DDS - Digital Dataphone Service
DDS - Direct Digital Service
DDS - Doctor of Dental Surgery; Doctor of Dental Science
DDS - Document Distribution Services
DDS - Dataphone Digital service carrier offering 2.4 - 56 kb/s
DDT - DicholoroDiphenylTricholoroethane
DDX - Digital Data eXchange, Device Dependent X (windows)
DDX - Distributed Data eXchange
DE - Delaware
DE - Disk Enclosure
DEA - Data Encryption Algorithm
DEA - Drug Enforcement Agency
DEAR - Department of Energy Acquisition Regulation
DEBNA - Digital Ethernet BI Network Adapter
DEC - Digital Equipment Corporation [Corporate name]
DECUS - Digital Equipment Computer Users Society
DELNI - Digital Ethernet Local Network Interconnect
DELQA - Digital Ethernet Lowpower Q-bus network Adapter
DELUA - Digital Ethernet Lowpower Unibus network Adapter
DEMPR - Digital Ethernet Multi-Port Repeater
DEPCA - Digital Ethernet Personal Computer-bus Adapter
DEQNA - Digital Ethernet Q-bus Network Adapter
DEREP - Digital Ethernet REPeater
DERP - Defective Equipment Replacement Program
DES - Data Encryption Standard
DESPR - Digital Ethernet Single Port Repeater
DESTA - Digital Ethernet thin-wire STation Adapter
DEUNA - Digital Ethernet Unibus Network Adapter
DEW - Distant Early Warning (as in DEW Line)
DEXEC - Diagnostic EXEc software
DF - Damage Free
DF - Direction Finding
DF - Direction Finding, "D/F"
DFC - Distinguished Flying Cross
DFD - Data Flow Diagram
DFE - Data Flow Editor
DFI - Digital Facility Interface
DFM - Distinguished Flying Medal
DFMS - Digital Facility Management System
DFRF - Dryden Flight Research Facility (now ADFRF)
DFS - Depth-First Search
DFS - Distributed File System
DFT - Discrete Fourier Transform
DFW - Dallas-Ft.Worth (regional airport)
DG - Data General [Corporate name]
DG - Dei Gratia (by the grace of God)
DG - Directional Gyro
DG - Director General
DGA - Direct Graphics Access
DGP - Dissimilar Gateway Protocol
DGSC - Defense General Supply Center
DHHS - Department of Health and Human Services
DHSS - Department of Health and Social Security (British)
DHSS - british Department of Health and Social Security
DIA - Defence Intelligence Agency
DIA - Document Interchange Architecture
DIAD - (magnetic) Drum Information Assembler / Dispatcher
DIAL - Direct Information Access Line
DIAS - Defense Automatic Integrated System
DIB - Device Independent Bitmap
DIB - Directory Information Bases
DIC - Digital Interface Controller
DID - Direct Inward Dialing [telephony]
DIF - Digital Interface Frame
DIF - Document Interchange Format
DIFMOS - Double Injection Floating Gate MOS
DIL - Dual InLine
DILOG - DIstributed LOGic
DIM - Data In the Middle
DIMS - Document Image Management System
DIN - Deutsche Industrie Normenausschuss
DIN - Deutsches Institut fur Normung
DINK - Double Income, No Kids
DIP - Dual Inline Package
DIR - Deliverly & Installation Request
DIRE - Dire Is Really Emacs
DIRT - Design In Real-Time
DIS - Draft International Standard (ISO)
DISA - Direct Inward System Access
DISOSS - DIStributed Office Support System
DIU - Digital Interface Unit
DIV - Division
DIX - DEC, Intel, Xerox (Ethernet hardware levels)
DIY - Do It Yourself
DJ - Disc Jockey
DLA - Defense Logistics Agency
DLC - Data Link Control
DLC - Digital Loop Carrier
DLC - Driver's License Compact (Uniform interstate treatment)
DLCU - Digital Line Carrier Unit
DLE - Data Link Escape
DLG - Digital Line Graph
DLI - Data Link Interface
DLL - Dial Long Lines
DLL - Dynamic Link Library
DLO - Dead Letter Office
DLS - Data Link Control
DLS - Digital Link Service
DLTU - Digital Line/Trunk Unit
DLUPG - Digital Line Unit-Pair Gain, "DLU-PG"
DM - Delta Modulation
DM - Dialog Manager
DM - District Manager
DM - Dungeon Master
DMA - Direct Memory Access
DMD - Directory Management Domain
DMD - Doctor of Dental Medicine
DME - Distance Measuring Equipment
DMI - Digital Multiplexed Interface
DML - Data Manipulation Logic
DMOS - Diffusion Metal Oxide Semiconductor (see MOS)
DMS - Data Management System
DMS - Digital Multiplexed System
DMS - Diskless Management Services
DMSP - Defense Meteorological Satellite Program
DMU - Data Manipulation Unit
DMV - Department of Motor Vehicles
DMZ - DeMilitarized Zone
DN - Directory Number
DNA - DeoxyriboNucleic Acid
DNA - Digital Network Architecture [DEC]
DNC - Direct Numerical Control
DNC - Dynamic Network Controller
DNCRI - [NSF (q.v.)] Division of Networking and Communications Research and Infrastructure
DNHR - Dynamic NonHierarchical Routing
DNI - DECnet Network Interface
DNIC - Data Network Identification Code [telephony]
DNL - Director of Naval Laboratories
DNR - Dialed Number Recorder [telephony]
DNS - Domain Name System
DNX - Dynamic Network X-connect
DOA - Dead On Arrival
DOB - Date Of Birth
DOC - Dynamic Overload Control
DOCS - Display Operator Console System
DOD - Department Of Defense [U.S. Government]
DOD - Department of Defense, "DoD"
DOE - Department Of Energy [U.S. Government]
DOE - Depends On Experience
DOHC - Dual OverHead Camshaft
DOJ - Department Of Justice [U.S. Government]
DOM - Data On Master group
DOMAIN - Distributed Operating Multi Access Interactive Network (Apollo)
DORE - Dynamic Object Rendering Environment
DOS - Disk Operating System
DOT - Department Of Transportation [U.S. Government]
DOTE - Director, Operational Test and Evaluation, "DOT&E"
DOTS - Digital Office Timing Supply
DOV - Data Over Voice [telephony]
DOW - Day Of Week
DP - Data Processing
DP - Demarcation Point
DP - Dial Pulse [telephony]
DP - Displaced Persons (expelled from native land)
DP - Display Postscript
DP - Double Play
DP - Draft Proposal
DPA - Delegation of Procurement Authority
DPAC - Dedicated Plant Assignment Center
DPANS - Draft Proposed American National Standard
DPC - Destination Point Code
DPE - Data Path Extender
DPI - Dots Per Inch
DPM - Defect Per Million
DPM - Digital Panel Meter
DPM - Directional Policy Matrix
DPMI - DOS Protected Mode Interface
DPNPH - Data Packet Network-Packet Handler, "DPN-PH"
DPP - Discounted Payback Period
DPS - Display PostScript
DPSK - Differential Phased-Shift Keying
DQ - Dairy Queen
DQ - Dragon Quest
DQDB - Distributed Queue Dual Bus a reservation-strategy MAN 150 Mb/s
DQL - Database Query Language
DR - Data Ready
DR - Data Receive
DR - Dead Reckoning
DR - Dining Room
DRAM - Dynamic Random Access Memory (as opposed to static RAM)
DRD - Data Reading Device
DRE - Directional Reservation Equipment
DRG - Democratic Republic of Germany (East Germany)
DRI - Defense Research Internet (replaces Arpanet)
DRI - Digital Research, Incorporated [Corporate name]
DRMU - Digital Remote Measurement Unit
DRP - DECnet Routing Protocol
DRS - Data Rate Select (RS-232)
DS - Digital Signal
DS - Digital carrier Span
DS - Direct Signal
DS - Directory Service
DS - Double-Sided
DSA - Dial System Assistance
DSA - Digital Storage Architecture
DSA - Directory Service Agent
DSAB - Distributed Systems Architecture Board
DSBAM - Double-SideBand Amplitude Module
DSC - Document Structuring Conventions
DSCS - Defense Satellite Communications System
DSD - Data Structure Diagram
DSDC - Direct Service Dial Capability
DSE - Data Structure Editor
DSEE - Domain Software Engineering Environment
DSI - Digital Speech Interpolation
DSM - Distinguished Service Medal
DSN - Deep Space Network
DSN - Digital Signal (level) N
DSO - Digital Storage Oscilloscope
DSO - Distinguished Service Order
DSP - Decessit Sine Prole (died without issue)
DSP - Defense Support Program (USAF/NRO)
DSP - Digital Signal Processor; Digital Signal Processing
DSP - Domain-Specific System
DSR - Data Set Ready (RS-232)
DSR - Digital Standard Runoff
DSR - Dynamic Service Register
DSRI - Digital Standard Relational Interface
DSS - Data Station Selector
DSS - Decision Support System
DSS - Direct Station Selection [telephony]
DSSI - Digital Storage Systems Interconnect
DST - Daylight Saving Time
DSTN - Double SuperTwisted Nematic
DSU - Digital Service Unit; Data Service Unit
DSU - Disk Subsystem Unit (Artecon)
DSX - Digital System X-connect
DT - Data Transmit
DT - Delirium Tremens
DT - Di-group Terminal
DTAS - Digital Test Access System
DTB - Data Transfer Bus
DTC - Design To Cost
DTC - Di-group Terminal Controller
DTC - Digital Trunk Controller
DTE - Data Terminal Equipment
DTF - Dial Tone First payphone [telephony]
DTG - Direct Trunk Group
DTI - Department of Trade and Industry (U.K.)
DTIF - Digital Transmission Interface Frame
DTL - Diode Transistor Logic
DTMF - Dial Tone Multi Frequency [telephony]
DTP - DeskTop Publishing
DTR - Data Terminal Ready
DTSS - Dartmouth TimeSharing System
DTU - Demand Transmission Unit
DTU - Di-group Terminal Unit
DU - Decision Unit
DUA - Directory User Agent
DUATS - Direct User Access Terminal System
DUI - Driving Under the Influence
DUT - Device Under Test
DUV - Data Under Voice
DV - Deo Vo lente (God willing)
DVC - Digital Voice Card
DVM - Digital Volt Meter
DVM - Doctor of Veterinary Medicine
DVMA - Direct Virtual Memory Access, see DMA, device uses MMU.
DVMRP - Distance-Vector Multicast Routing Protocol
DVX - Digital Voice eXchange
DW - Dead Weight
DWAPS - Defense Warehousing Automated Processing System
DWB - Designer's WorkBench
DWB - Documenter's WorkBench
DWI - Driving While Intoxicated
DWIM - Do What I Mean
DX - Distance (as in long distance radio communication)
DXT - Data eXtractT facility


E - East E - Espionage E911 - Enhanced 911 EAA - Experimental Aircraft Association EADAS - Engineering and Administrative Data Acquisition System EADASNM - Engineering and Administrative Data Acquisition System/Network Management, "EADAS/NM" EADASS - Engineering and Administrative Data AcquiSition System EAEO - Equal Access End Office EAFB - Edwards Air Force Base EARN - European Academic Research Network EAS - Engineering Administration System EAS - Extended Announcement System EAS - Extended Area Service EASD - Equal Access Service Date EASI - Enhanced Asynchronous SCSI Interface EBCDIC - Extended Binary Coded Decimal Interchange Code EBI - Extensive Background Investigations EC - European Community EC - Exchange Carrier [telephony] ECAD - Electronical Computer Aided Design ECAFE - Economic Commission for Africa and the Far East ECAP - Electronic Customer Access Program ECASS - Electronically Controlled Automatic Switching System ECASS - Export Control Automated Support System ECC - Enter Cable Change ECC - Error Checking and Correcting ECC - Error Correction Code ECCM - Electronic Counter-CounterMeasures ECCS - Economic C (hundred) Call Seconds ECD - East Coast Division (Sun) ECDO - Electronic Community Dial Office ECF - Enhanced Connectivity Facility ECG - ElectroCardioGram ECL - Emitter Coupled Logic (see also TTL) ECL - Error Correction Logic ECLSS - Environmental Control and Life Support System [Space] ECM - Electronic Counter Measure ECM - European Common Market ECMA - European Computer Manufacturers Association ECN - Engineering Computer Network (at Purdue) ECO - Ecological ECO - Electronic Central Office ECO - Engineering Change Order ECOM - Electronic Computer Originated Mail, "E-COM" ECPA - Electronic Communication Privacy Act ECPT - Electronic Coin Public Telephone ECR - Engineering Change Request ECS - Electronic Crosconnect System ECS - Environmental Control System ECSA - Exchange Carriers Standards Association ECT - ElectroConvulsive Therapy ECV - Electric Cargo Vehicle [NASA OEXP] EDA - Electronic Design Automation EDAC - Electromechanical Digital Adapter Circuit EDD - Expert Dungeons & Dragons, "ED&D" EDF - Electricite de France EDGAR - Electronic Data Gathering, Analysis, and Retrieval EDI - Electronic Data Interchange EDIF - Electronic Design Interchange Format EDO - Extended Duration Orbiter [Space] EDP - Electronic Data Processing EDS - Electronic Data Systems EDSX - Electronic Digital Signal X-connect EDT - Eastern Daylight Time EDTA - Ethylene Diamine Tetraacetic Acid EDTCC - Electronic Data Transmission Communications Central EE - Electrical or Electronics Engineer EEC - European Economic Community EECT - End-to-End Call Trace EEDP - Expanded Electronic tandem switching Dialing Plan EEG - ElectroEncephaloGram EEHO - Either End Hop Off EEI - Equipment-to-Equipment Interface EEL - Epsilon Extension Language EEM - External Expansion Module (Sun) EEO - Errors and Omissions Excepted, "E&EO" EEPROM - Electrically Erasable Programmable Read Only Memory EFD - Ellington Field, Houston TX EFI - Electronics For Imaging (Co.) EFIS - Electronic Flight Instrumentation System EFRAP - Electronic Feeder Route Analysis Program EFS - Error Free Seconds EG - Exempli Gratia, "e.g." (for example) EGA - Enhanced Graphics Adapter EGP - Exterior Gateway Protocol EGREP - Extended GREP EGRET - Energetic Gamma Ray Experiment Telescope (on GRO) EHF - Extremely High Frequency (30-300GHz) EHP - Error Handling Package EIA - Electronics Industry Association EIN - Employer Identification Number EINE - EINE Is Not Emacs EIS - Environmental Impact Statement EIS - Executive Information Systems EIS - Expanded Inband Signaling EIS - Extended Instruction Set EISA - Extended Industry-Standard Architecture EISB - Electronic Imaging Standards Board EISS - Economic Impact Study System EISS - European Intelligence Support System EITS - Encoded Information TypeS EJASA - Electronic Journal of the Astronomical Society of the Atlantic EKG - ElectroKardioGramm (see ECG) EKTS - Electronic Key Telephone Sets EL - ElectroLuminescent (as in display) ELC - Extra(Excellent) Low Cost ELF - Extensible Linking Format ELF - Extremely Low Frequency ELLE - Elle Looks Like Emacs ELM - ELectronic Mailer ELO - Electric Light Orchestra ELP - Emerson, Lake and Palmer (or Powell) ELT - Emergency Locator Transmitter ELV - Expendable Launch Vehicle [Space] EM - Engineering Model EM - Enlisted Man (see EW) EM - ``Ear & Mouth''; recEive & transMit leads of a signalling system, "E&M" EMA - Electronic Mail Association EMA - Enterprise Management Architecture (DEC) EMACS - Editor MACroS; Eight Megabytes And Constantly Swapping EMAIL - Electronic MAIL, "E-MAIL" EMC - ElectroMagnetic Compatibility EMF - ElectroMotive Force EMI - ElectroMagnetic Interference EML - Expected Measured Loss EMP - ElectroMagnetic Pulse EMPRESS - EnvironMental Pulse Radiation Environment Simulator for Ships EMR - ElectroMagnetic Response EMS - Electronic Message System EMS - Element Management System EMS - Extended Memory Specification EMS - Element Management System, part of AT&T's UNMA EMT - Emergency Medical Technician EMU - ElectroMagnetic Unit EMU - Extravehicular Mobility Unit [Space] ENEA - Comitato Nazionale per la Ricerca e per lo Sviloppo dell' Energia Nuclaeare e delle Energie Alternative, Italy ENET - Ethernet, "E-Net" ENFIA - Exchange Network Facility for Interstate Access ENIAC - Electronic Numerical Integrator and Calculator ENS - ENSign EO - End Office [telephony] EO - Erasable Optical EOD - Erasable Optical Disk EOE - Electronic Order Exchange EOE - Equal Opportunity Employer EOF - End Of File EOM - End Of Month EOS - Earth Observing System EOS - Electrical OverStress EOS - Extended Operating System EOS - Electro Optical System EOT - End Of Transmission EOTT - End Office Toll Trunking EP - Emulation Program EP - Experience Points EP - Extended Play EPA - Enhanced Performance Architecture EPA - Environmental Protection Agency EPD - Entry Products Division EPL - Electronic switching system Program Language EPOS - Engineering and Project-management Oriented Support system EPPS - Electronic Pre-Press Systems. EPRI - Electric Power Research Institute EPROM - Erasable Programmable Read-Only Memory EPS - Encapsulated PostScript EPSCS - Enhanced Private Switched Communication Service EPSF - Encapsulated PostScript File EPSF - Encapsulated PostScript Format EPSI - Encapsulated PostScript Interchange EPT - Empire of the Petal Throne EPTS - Electronic Problem Tracking System EPUB - Electronic PUBlication EPW - Enemy Prisoner of War EQ - Educational Quotient (see IQ) EQUEL - Embedded QUEL ER - Emergency Room ER - Error Register ERA - Earned Run Average ERA - Entity-Relationship-Attribute ERA - Equal Rights Amendment ERAR - Error Return Address Register ERD - Entity-Relationship Diagram ERE - Entity-Relationship Editor EREP - Environmental Recording Editing and Printing ERICA - Experiment on Rapidly Intensifying Cyclones over the Atlantic ERICA - Eyegaze Response Interface Computer Aid ERISA - Employee Retirement Income Security Act ERL - Echo Return Loss ERP - Effective Radiated Power ERS - Earth Resources Satellite (as in ERS-1) ERT - Earth Resources Technology [Space] ERU - Error Return address Update ES - End System ES - Expert System ESA - Enterprise Systems Architecture (MVS/XA followon) ESA - European Space Agency ESAC - Electronic Surveillance Assistance Center ESAC - Electronic Systems Assistance Center ESB - Emergency Service Bureau ESD - ElectroStatic Discharge ESD - Engineering Service Division ESDI - Enhanced Standard Device Interface ESE - East South East ESF - Extended SuperFrame ESF - Extended Superframe Format ESH - End System Hello ESI - ElectroStatic Interference ESIS - End System-Intermediate System, "ES-IS" ESL - Emergency Stand-Alone ESM - Electronic Support Measures ESM - External Storage Module (Sun) ESMD - Embeded Storage Module Disk ESMD - Enhanced Storage Module Device ESN - Electronic Serial Number ESN - Electronic Switched Network ESO - European Southern Observatory ESOP - Employee Stock Ownership Plan ESP - Enhanced Service Provider ESP - Extra Sensory Perception ESPEC - Ethernet SPECification (DIX) ESPS - Entropic Signal Processing System ESS - Electronic Switching System [telephony] ESS - Environmental Stress Screening ESSEX - Experimental Solid State EXchange ESSX - Electronic Switching Systen eXchange EST - Eastern Standard Time ET - Eastern Time ET - External Tank [of the US Space Shuttle] ET - ExtraTerrestrial [Space] ETA - Estimated Time of Arrival ETACC - External Tank/Aft Cargo Carrier, "ET/ACC" (see also ET) [Space] ETAS - Emergency Technical ASsistance ETC - Et cetera, and so on... ETD - Estimated Time of Departure ETF - Electronic Toll Fraud ETFD - Electronic Toll Fraud Device [telephony] ETH - Eidgnoessiche Techniche Hochschule ETLA - Extended Three Letter Acronym ETN - Electronic Tandem Network ETO - Earth-to-Orbit [Space] ETR - Eastern Test Range ETS - Electronic Tandem Switching ETS - Electronic Translation System ETSACI - Electronic Tandem Switching Adminstration Channel Interface ETSI - European Telecommunication Standards Institute ETSSP - ETS Status Panel ETV - Education TeleVision EUC - Extended Unix Code EUNET - European UNIX Network EUNET - European UNIX network, "EUnet" EUUG - European UNIX Users Group EUV - Extreme UltraViolet EUVE - Extreme UltraViolet Explorer EVA - ExtraVehicular Activity EVX - Electronic Voice eXchange EW - Electronic Warfare EW - Enlisted Woman (see EM) EWO - Engineering Work Order EWOS - European Workshop for Open Systems EWS - Engineering Work Station EXPO - World Exposition


FA - Factory Automation FA - Finance Accounting (Sun) FA - Football Association (British soccer) FA - Fuse Alarm FAA - Federal Aviation Administration (U.S.) FAB - Feature-Advantage-Benefit FACD - Foreign Area Customer Dialing FACOM - Fujitsu Automatic Computer FACS - Facilities Assignment and Control System FAE - Fuel Air Explosive FAESHED - Fuel Air ExploSive, HElicopter Delivered FAG - Forced Air Gas FAI - Federation Aeronautique International FAO - Food and Agriculture Organization [U.S. Government] FAQ - Frequently-Asked Question(s) FAQL - Frequently-Asked Questions List FAR - Federal Acquisition Regulation FAR - Federal Aviation Regulations (U.S.) FAR - Federation of American Research FARNET - Federation of American Research NETworks FAS - Foreign Agricultural Service FAS - Free Alongside Ship FASST - Flexible Architecture Standard System Technology FAST - Fast Auroral SnapshoT explorer FAST - First Application System Test FAT - File Allocation Table FAT - Foreign Area Translation FAX - FAcsimile FB - Freight Bill FBI - Federal Bureau of Investigation [U.S. Government] FBO - Fixed-Base Operator FBV - a Dutch acronym for "Fluke, Ltd." FC - Full Color FCAP - Facility CAPacity FCC - Federal Communications Commission [U.S. Government] FCC - Federal Computer Conference FCC - Forward Command Channel FCCSET - Federal Coordinating Council for Science, Education and Technology (under OSTP) FCFS - First Come, First Served FCG - False Cross or Ground FCO - Field Change Order FCRC - Federal Contract Research Center FCS - File Control Systemction FCS - First Customer Ship (SunOS Releases) FCS - Frame Check/Control Sequence FCT - Four Corner Test (4FCT) FD - File Descriptor FD - Floppy/Flexible Disk(ette)/Drive FDA - Food and Drug Administration [U.S. Government] FDDI - Fiber Distributed Data Interface FDDIII - FDDI supporting isochronous traffic, "FDDI-II" FDHD - Floppy Drive High Density FDIC - Federal Deposit Insurance Corporation [U.S. Government] FDM - Frequency-Division Multiplexing FDP - Field Development Program FDR - Franklin Delano Roosevelt FDX - Full DupleX FE - Format Effecters FE - Front End FEA - Finite Element Analysis FEC - Forward Error Correction FED - Far End Data FEDSIM - FEDeral Systems Integration and Management center FEHQ - Fluke European HeadQuarters FEM - Finite Element Modeling FEMA - Federal Emergency Management Agency FEMF - Foreign Electro-Motive Force FEP - Fluorinated Ethylene Propylene FEP - Front End Processor FEPC - Fair Employment Practices Commission FEPS - Facility and Equipment Planning System FERS - Federal Employees Retirement System FET - Far East Trading FET - Federal Excise Tax FET - Field Effect Transistor FEV - Far End Voice FF - Flip-Flop FFA - Field Failure Analysis FFA - Future Farmers of America FFRDC - Federally Funded Reseach and Development Center FFS - Fast File System FFT - Fast Fourier Transform FGA - Feature Group A, "FG-A" [telephony:Line Side term. for LD carriers] FGB - Feature Group B, "FG-B" [telephony:Trunk Side term. for LD carriers (aka ENFIA B), 950 service] FGC - Feature Group C, "FG-C" [telephony] FGD - Feature Group D, "FG-D" [telephony:Trunk Side term. for LD carriers, 1+ service] FGREP - Fixed GREP FGS - Fine Guidance Sensors (on HST) FHA - Federal Housing Administration FHA - Future Homemakers of America FHLMC - Federal Home Loan Mortgage Association (Freddie Mac) FHMA - Federal Home Mortgage Association (Fannie Mae) FHST - Fixed Head Star Trackers (on HST) FIB - Focused Ion Beam FICA - Federal Insurance Contributions Act FIDO - Fog Investigation Dispersal Operation FIFO - First In, First Out FILO - First In, Last Out FIMS - Forms Interface Management System FIN - Field Information Notice FINE - FINE Is Not Emacs
FIO - Frequency In and Out
FIOC - Frame Input/Output Controller
FIP - Facility Interface Processor
FIPS - Federal Information Processing Standard
FIR - Far InfraRed
FIR - Field Information Report
FIR - Finite Impulse Response
FIRMR - Federal Information Resource Management Regulation
FIT - Federal Information Technologies, inc.
FITS - Flexible Image Transport System
FL - Florida
FLACC - Full Level Algol Checkout Compiler
FLOP - FLoating point OPeration
FLOPS - FLoating-point OPerations per Second
FLRA - Federal Labor Relations Authority
FLS - Floating License Server
FLT - Front Load Tape
FM - Frequency Modulation
FMAC - Facility Maintenance And Control
FMB - Federal Maritime Board
FMC - Flexible Manufacturing Cell
FMCS - Federal Mediation and Conciliation Service
FMEA - Failure Mode and Effect Analysis
FMR - Field Marketing Representative (Sun)
FMS - Financial Management Service (Treasury Dept)
FMS - Flexible Machining/Manufacturing System
FMS - Forms Management System
FNC - Federal Networking Council
FNPA - Foreign Numbering Plan Area
FO - Forecast Order
FO - Foreign Office
FO - Forward Observer
FOAC - Federal Office Automation Center
FOB - Free On Board
FOC - Faint Object Camera (on HST)
FOC - Fiber Optic Communications
FOC - Free Of Charge
FOIA - Freedom Of Information Act
FOIMS - Field Office Information Management System
FOIRL - Fiber Optic Inter Repeater Link
FON - Fiber Optics Network
FOR - Free On Rail
FORCS - Faa's Operational Reporting Communication System
FORD - Fix Or Repair Daily
FORD - Found On Road Dead
FORTRAN - FORmula TRANslator
FOS - Faint Object Spectrograph (on HST)
FOSE - Federal Office Systems Exposition
FOT - Fiber Optic Transceiver
FOT - Free On Truck
FOV - Field Of View
FPA - Floating Point Accelerator
FPC - Fish Protein Concentrate
FPC - Floating Point Coprocessor
FPDU - FTAM Protocol Data Unit
FPE - Floating Point Engine
FPE - Foam PolyEthylene
FPHA - Federal Public Housing Authority
FPLA - Field Programmable Logic Array (see PLA)
FPM - Feet Per Minute
FPO - Fleet Post Office
FPP - Floating Point Processor
FPS - Favorite Play Sequence
FPS - Feet Per Second
FPS - Foot-Pound-Second
FPU - Floating Point Unit
FQDN - Fully-Qualified Domain Name
FR - Flat Rate
FRACTAL - FRACTional dimensionAL
FRAM - Ferroelectric RAM
FRB - Federal Reserve Board
FRD - Fire RetarDant
FRED - Fred Resembles Emacs Deliberately
FREE - Fathers Rights and Equality Exchange
FRG - Federal Republic of Germany (West Germany)
FRICC - Federal Research Internet Coordinating Committee
FROG - Free Rocket Over Ground
FRPG - Fantasy Role Playing Game
FRR - Flight-Readiness Review
FRS - Federal Reserve System
FRS - Flexible Route Selection
FRU - Field Replacable Unit
FS - Field Service
FS - File System
FS - Floppy System
FSCM - Federal Supply Code for Manufactures
FSDO - Flight Standards District Office
FSE - Field Service Engineer
FSF - Free Software Foundation
FSK - Frequency Shift Keying
FSLIC - Federal Savings and Loan Insurance Corporation
FSS - Fast System Switch (System V)
FSS - Federal Supply Service
FSS - Flight Service Station
FSU - Florida State University
FSU - Former Soviet Union
FSW - Forward Swept Wings
FT - Foot
FT1 - fractional T1, common carrier transmission in multiples of 64 kb/s
FTAM - File Transfer, Access, and Management (ISO FTP equivalent)
FTC - Federal Trade Commission
FTE - Factory Test Equipment
FTG - Final Trunk Group
FTL - Faster Than Light
FTP - File Transfer Protocol
FTPI - Flux Transitions Per Inch
FTS - Federal Telecommunications System [US Government]
FTS - Federal Telephone System [telephony]
FTS - Flight Telerobotic Servicer [Space]
FTW - File Tree Walk
FTZ - Free Trade Zone
FUBAR - F***ed Up Beyond All Recognition
FUD - Fear, Uncertainty, and Doubt
FUS - Full-Use Standard
FUSE - Far Ultraviolet Spectroscopic Explorer
FV - folio verso, "fv" (on the back of the page)
FW - Fringeworthy
FWD - Front Wheel Drive
FWHM - Full Width at Half Maximum
FWIW - For What It's Worth
FX - Foriegn eXchange [telephony]
FX - special effects
FY - Fiscal Year
FYA - For Your Action
FYI - For Your Information
FYS - For Your Signature


G - Gravity GA - Gamblers Anonymous GA - General Assembly GA - General Average GA - General of the Army GA - Georgia GAAP - Generally Accepted Accounting Principles GAAS - Gallium Arsenide, "GaAs" GAB - Group Audio Bridging [telephony] GADO - General Aviation District Office GAIA - Earth's self-sustaining Biosphere, "Gaia" GAIA - GUI Application Interoperability Architecture GAN - Global Area Network GAO - General Accounting Office GAR - Grand Army of the Republic GAS - Get-Away Special GATED - GATEway Deamon GATT - General Agreement on Tariffs and Trade GAW - Guaranteed Annual Wage GB - Gangbusters GB - GigaByte GB - Great Britain GBIP - General Purpose Interface Bus GBS - Group Bridging Service GBT - Green Bank Telescope GC - Garbage Collection (LISP) GC - Gas Chromatograph(y) GC - Graphic Context GCA - General Communications Architecture (Ingres) GCA - Ground Controlled Approach GCC - Gnu C Compiler GCD - Ground Controlled Descent GCL - Graphics Command Language GCM - General Court Martial GCR - Group-Coded Recording (magnetic tape, 6250 bpi) GCS - Group Control System GCT - Greenwich Civil Time GCVS - General Catalog of Variable Stars GDB - Gnu DeBugger GDP - Gross Domestic Product GDS - Great Dark Spot GE - General Electric GECOS - General Electric Comprehensive Operating System GECR - Global Environmental Change Report GEIS - General Electric Information Systems GEISCO - General Electric Information Services COmpany GEM - Giotto Extended Mission GEM - Graphics Environment Manager GEMS - General Electric Medical Systems GEO - Geosynchronous Earth Orbit [Space] GFCI - Ground Fault Circuit Interrupter GGP - Gateway-to-Gateway Protocol GHQ - General HeadQuarters GHRS - Goddard High Resolution Spectrograph (on HST) GHZ - Giga HertZ, "GHz" (unit of frequency, 1,000,000,000 cycles per second) GI - Galvanized Iron GI - Gastro Intestinal GI - General Issue GI - Government Issue GID - Group IDentity GIF - Graphics Interchange Format GIGO - Garbage In, Garbage Out GIN - Graphics INput GISS - Goddard Institute for Space Studies GJIAGDVYFCN - Go Jump In a God Damned Volcano, You Fucking Cave Newt (talk.bizarre) GKS - Graphical Kernel Standard GKSM - GKS Metafile GLOMR - Global Low-Orbiting Message Relay GM - Game Master GM - General Manager GM - General Motors GM - Guided Missile GMBH - Gesellschaft Mit Beschraenkter Haftung GMC - Giant Molecular Cloud GMRT - Giant Meter-wave Radio Telescope GMT - Greenwich Mean Time GMW - Give me More Windows GND - GrouND GNMA - Government National Mortgage Association (Ginnie Mae) GNP - Gross National Product GNU - GNU's Not Unix GOES - Geostationary Orbiting Environmental Satellites GOK - God Only Knows GOP - Grand Old Party GOS - Grade Of Service GOSIP - Government Open Systems Interconnection Profile GOX - Gaseous OXygen GP - General Practitioner GP - Grand Prix GP - Graphics Processor GP - Group Processor GPC - General Purpose Computer GPCI - Graphics Processor Command Interface GPD - Graphics Products Division GPI - Graphics Programming Interface GPIB - General-Purpose Interface Bus GPL - GNU Public License GPL - General Public License GPL - Graphics Programming Language GPM - Gross Product Margin GPO - General Post Office GPO - Government Printing Office GPS - General Problem Solver GPS - Global Positioning System [Space] GPSI - Graphics Processor Software Interface GPSS - General Purpose System Simulator GQ - General Quarters GRASS - Geographical Resources Analysis Support System GRB - Gamma Ray Burst(er) GRD - GRounD GREP - Global Regular Expression Print, g/re/p, (UNIX command) GRI - Graduate, Realtors Institute GRIPS - Government Raster Image Processing Software GRO - Gamma Ray Observatory [Space] GROPE - Graphical representation of protocols in Estelle GRPMOD - GRouP MODulator, "GRP MOD" GRS - Gamma Ray Spectrometer (on Mars Observer) GRS - Great Red Spot GS - General Schedule GS - Glide Slope GS - Gray-Scale GSA - General Services Adminstration [U.S. Government] GSA - Girl Scouts of America GSA - Government Services Administration GSAT - General telephone and electronics SATellite corporation GSBCA - General Services administration Board of Contract Appeals GSC - Guide Star Catalog (for HST) GSFC - Goddard Space Flight Center (Greenbelt, MD) [NASA] GSTS - Ground-based Surveillance and Tracking System GT - Gross Ton GT - Group Technology GTC - General Telephone Company GTE - General Telephone and Electric [Corporate name] GTO - Geostationary Transfer Orbit GTSI - Government Technology Services, inc. GTT - Global Title Transmission GUI - Graphical User Interface GUIDE - Graphical User Interface Design Editor (Sun) GUS - Guide to the Use of Standards (SPAG publication) GW - Gamma World GWEN - Ground Wave Emergency Network GWS - Graphics Work Station


H - Harn H - Height HA - Home Automation HACD - Home Area Customer Dialing HAL - Hard Array Logic HAL - Heuristically programmed ALgorithmic computer (2001) HAM - Hold And Modify HAO - High Altitude Observatory HAP - Host Access Protocol HARM - High-Availability, Reliability, and Maintainability HASP - Houston Automated Spooling Program HAT - Hashed Address Table HB - HemogloBin, "Hb" HBA - Host Bus Adapter (SCSI) HBM - Her British Majesty; His British Majesty HBO - Home Box Office HC - Holy Communion HC - House of Commons HCF - Halt and Catch Fire HCFA - Health Care Financing Administration HCL - High Cost of Living HCL - Host Control Links HCR - Hodge Computer Research, inc. HCSDS - High-Capacity Satellite Digital Service HCTDS - High-Capacity Terrestrial Digital Service HD - Hard Disk HD - Heavy Duty HD - Henry Draper catalog entry HDA - Head Disk Assembly (in winchester disk drives) HDBV - Host Data Base View HDL - High Density Lipoprotein HDLC - High-level Data Link Control HDTV - High Definition TeleVision HDX - Half DupleX HE - His Eminence; His Excellency HEAO - High Energy Astronomical Observatory [satellite] HEAP - Home Energy Assistance Program HEDM - High Energy-Density Matter [Space] HEHO - High End Hop Off HEM - High-level Entity Management HEMP - Help End Marijuana Prohibition HEMS - High-level Entity Management System HEMT - High Electron Mobility Transistor HEO - High Earth Orbit [Space] HEP - High Energy Physics HERA - HErmes Robotic Arm, "HeRA" HERO - Hazards of Electromagnetic Radiation to Ordnance HF - Hawthorne Farms (Intel) HF - High Fantasy HF - High Frequency (3-30MHz) HFE - Human Factors Engineering HFS - Hierarchical File System (Apple Macintosh) HGA - High Gain Antenna HI - Hawaii HIC - Hybrid Integrated Circuit HIFO - Highest-In, First-Out HIIPS - Hud Integrated Information Processing Services HIPPI - HIgh Performance Parallel Interface HIRES - HI-RESolution HIS - Honeywell Information System HIV - Human Immuno-deficiency Virus HLC - Heavy Lift Capability [Space] HLHSR - Hidden Line & Hidden Surface Removal HLL - High-Level Language HLV - Heavy Lift Vehicle [Space] HM - High-resolution Monochrome HMC - Halley Multicolor Camera (on Giotto) HMOS - High performance Metal Oxide Semiconductor (see MOS) HMP - Host Monitoring Protocol HMS - His/Her Majesty's Ship HMT - His/Her Majesty's Transport HNPA - Home Numbering Plan Area [telephony] HNS - Hospitality Network Service HOBIC - HOtel Billing Information Center HOBIS - HOtel Billing Information System HOL - High-Order System HOTOL - HOrizontal Take-Off and Landing HOW - Home Owners Warranty HP - Hewlett-Packard, inc. [Corporate name] HP - High Pressure HP - Higher Power (sort of an AA "in" term, usually God) HP - Hit Points HP - HorsePower HPD - High Performance Division (Sun group) HPGe - High Purity Germanium HPIB - Hewlett-Packard Interface Bus HPLT - High-Productivity Languages/Tools, "HPL/T" HPN - White Plains NY HPO - High Performance Option HPPA - HP Precision Architecture HQ - HeadQuarters HR - Hertzsprung-Russell (diagram) HR - House of Representatives HR - Human Resources HRH - Her/His Royal Highness HRI - High Resolution Imager (on ROSAT) HS - High School HSB - Hue, Saturation, Brightness HSC - Hierarchical Storage Controller HSFS - High Sierra File System HSI - High Speed Interface HSI - Horizontal Situation Indicator HSLN - High Speed Local Network HSP - High Speed Photometer (on HST) HSSDS - High-Speed Switched Digital Service HST - Hawaiian Standard Time HST - High Speed Technology HST - Hubble Space Telescope HT - High Tension (as in electric power transmission) HT - Horizontal Tab HTK - Hits To Kill HU - High Usage HUAC - House Unamerican Activities Committee HUD - Heads Up Display HUD - Housing and Urban Development [U.S. Government] HUGE - Hewlett-packard Unsupported Gnu Emacs HUT - Hopkins Ultraviolet Telescope (ASTRO package) HUTG - High Usage Trunk Group HV - High Voltage HVAC - Heating, Ventilation, and Air Conditioning HW2000 - Highway 2000 HWD - Hayward CA HWM - High-Water Mark HZ - HertZ, "Hz" (unit of frequency, cycles per second)


I18N - InternationalizatioN (count the letters) IA - Inspection Authorization IAB - Interactive Application Builder IAB - Internet Activities Board IAD - Dulles International, Washington DC IAEA - International Atomic Energy Agency IAH - Houston (Intercontinental) TX IANA - Internet Assigned Numbers Authority IAPPP - International Amateur/Professional Photoelectric Photometry IATA - International Air Transport Association IAU - International Astronomical Union IAUC - IAU Circular IB - Instruction Buffer IBM - Ingrained Batch Mentality IBM - International Brotherhood of Magicians IBM - International Business Machines [Corporate name] IBM - Itty Bitty Machines IBN - Integrated Business Network IC - Independent Carrier IC - Integrated Circuit IC - Inter-LATA Carrier IC - Interexchange Carrier [telephony] (see also IEC) ICAN - Individual Circuit ANalysis ICB - Interstate Computer Bank ICBM - InterContinental Ballistic Missile ICBW - I Could Be Wrong ICC - Interstate Commerce Commission ICCC - Inter-Client Communication Convention (X) ICCCM - Inter-Client Communication Conventions Manual ICD - Interactive Call Distribution ICE - In-Circuit Emulator ICE - International Cometary Explorer ICE - Intrusion Countermeasures Electronics ICI - Imperial Chemical Industries ICJ - International Court of Justice ICL - International Computers Limited ICLID - Individual Calling Line ID ICM - Integrated Call Management ICMP - Internet Control Message Protocol ICON - Inter CONtinental ICP - Integrated Channel Processor ICP - Inventory Control Points ICRC - International Cosmic Ray Conference ICSC - Inter-LATA Customer Service Center ICST - Institute for Computer Science and Technology ICT - In-Circuit Test ICT - Interactive Consumer Terminal ID - IDentification ID - Idaho IDA - Intercommunication Data Areas IDA - International Dark-sky Association IDA - International Development Association IDC - Insulation Displacement Contact IDDD - International Direct Distance Dial [telephony] IDE - Integrated Development Environment IDE - Integrated Drive Electronics IDE - Interactive Development Environments, inc IDEA - International Dance Exercise Association IDEA - Internet Design, Engineering, and Analysis notes (IETF RFCs) IDF - Intermediate Distributing Frame [telephony] IDI - Initial Domain Identifier IDL - Interactive Data Language IDL - Interface Description Language IDM - Image Data Manager IDP - Initial Domain Part IDP - Internet Datagram Protocol (XNS equivalent to IP) IDS - Internal Directory System IDV - Interlibrational Derived Vehicle [Space] IDVC - Integrated Data/Voice Channel IE - Id Est (that is) IE - Id Est, "i.e." (that is) IE - Indo-European IE - Inter Ethernet IEC - InterExchange Carrier [telephony] (see also IC) IEC - International Electrotechnical Commission IEE - Institute of Electrical Engineers (UK) IEEE - Institute of Electrical and Electronics Engineers IEN - Internet Engineering Notes IEN - Internet Experiment Notebook (precedes RFCs) IESG - Internet Engineering Steering Group IETF - Internet Engineering Task Force IF - InterFace, "I/F" IF - Intermediate Frequency IFB - Invitation For Bids IFC - International Finance Corporation IFC - International Freighting Corporation IFF - Identification - Friend or Foe IFF - Image File Format IFF - Interchange File Format IFF - Iterative Function Fractal IFIP - International Federation for Information Processing IFLA - International Federation of Library Associations IFR - Instrument Flight Rules IFRPS - Intercity Facility Relief Planning System IGES - Initial Graphics Exchange Standard IGM - InterGalactic Medium IGMP - Internet Group Multicast Protocol IGP - Interior Gateway Protocol IGY - International Geophysical Year
IHP - Indicated HorsePower
IHS - Integrated Hospital Support
IIA - Information Industry Association
IIE - Institute of Industrial Engineers
IIHF - International Ice Hockey Federation
IIL - Integrated Injection Logic
IIN - Integrated Information Network
IISPB - Image and Information Standards Policy Board
ILO - International Labor Organization
ILS - Instrument Landing System
ILV - Industrial Launch Vehicle [Space]
IM - Installation & Maintenance, "I&M"
IM - Interface Module
IMAP - Interactive Mail Access Protocol
IMAP3 - Interactive Mail Access Protocol - Version 3
IMAS - Integrated Mass Announcement System
IMC - Instrument Meteorological Contitions
IMD - Industry Marketing Development
IMF - International Monetary Fund
IMHO - In My Humble Opinion [net jargon]
IMM - Input Message Manual
IMP - Interface Message Processor [ARPANET/MILNET] (replaced by PSN)
IMPACT - Inventory Management Program and Control Technique
IMS - Integrated Management System
IMSA - International Motor Sports Association
IMSL - International Mathematical Subroutine Library
IMSO - Integrated Micro Systems Operation (Intel)
IMSVS - Information Management System/Virtual Storage, "IMS/VS"
IMT - Image Management Terminal
IMT - Inter-Machine Trunk
IMTS - Improved Mobile Telephone Service
IN - Indiana
IN - Intelligent Network
INADS - INitialization and ADministration System [telephony]
INC - InterNational Carrier
INGRES - Interactive Graphic Retrieval System
INL - Inter Node Link
INMS - integrated network management system, part of AT&T's UNMA
INN - Inter Node Network
INOC - Internet Network Operations Center
INRI - Iesus Nazerenus Rex Iudaeorum (Jesus of Nazareth, King of the Jews)
INRIA - Institut National de Recherche en Informatique et Automatique
INS - Immigration and Naturalization Service
INS - Inertial Navigation System
INS - Information Network System
INSTITUTE - INSTITUTE's Name Shows That It's Totally Unrelated To EMACS
INTAP - INteroperability Technology Association for information Processing
INTELSAT - INternational TELecommunications SATellite consortium
INWATS - INward Wide Area Telephone Service [telephony]
IO - Input/Output (sometimes I/O)
IO - Input/Output, "I/O"
IO - Inward Operator
IOC - Input/Output Computer (Aptec)
IOC - Input/Output Controller
IOC - International Operating Center [telephony, US]
IOCC - International Overseas Completion Center
IOD - Identified Outward Dialing
IONL - Internal Organization of the Network Layer
IOOF - International Order of Odd Fellows
IOP - Input-Output Processor
IOT - InterOffice Trunk
IOTA - Infrared-Optical Telescope Array
IOTA - International Occultation Timing Association
IOU - I Owe you (U)
IOW - In Other Words
IP - Industrial Products
IP - Information Provider [telephony]
IP - Innings Pitched
IP - Intermediate Point
IP - Internet Protocol
IPC - Integrated Personal Computer
IPC - InterProcess Communication
IPC - Inventory Process Control
IPCC - Intergovernmental Panel on Climate Change
IPCE - InterProcess Communication Environment
IPCS - Interactive Problem Control System
IPDU - Internet Protocol Data Unit
IPE - Integrated Programming Environment
IPI - Intelligent Peripheral Interface
IPL - Initial Program Load
IPLAN - Integrated PLanning And Analysis
IPM - Impulses Per Minute
IPM - Interruptions Per Minute
IPMS - InterPersonal Message Services
IPO - Initial Public Offering
IPO - International Procurement Office
IPS - Inches Per Second
IPS - Inertial Pointing System
IPS - Information Processing Standards
IPSE - Integrated Project-Support Environment
IPT - Williamsport PA
IPX - Internetwork Packet exchange (of Novell Inc.)
IQ - Intelligence Quotient (see EQ)
IQR - Inquiry
IR - Index Register
IR - Information Resource
IR - InfraRed
IR - Internetwork Router
IRA - Individual Retirement Account
IRA - Interprocedural Register Allocation
IRA - Irish Republican Army
IRAF - Image Reduction and Analysis Facility
IRAS - Infrared Astronomical Satellite
IRBM - Intelligent Repeater Bridge Module
IRBM - Intermediate Range Ballistic Missile
IRC - International Record Carrier
IRC - Internet Relay Chat
IRD - Investment Recovery Department
IRDS - Information Resource Dictionary Standard
IRDS - InfraRed Detection Set
IRE - Institute of Radio Engineers (old name for the now IEEE, q.v.)
IRG - InterRecord Gap
IRM - Information Resources Management
IRM - Intelligent Repeater Module
IRMS - Information Resources Management Service
IRN - Intermediate Routing Node
IROR - Internal Rate Of Return
IRS - Inertial Reference System
IRS - Internal Revenue Service
IRSG - Internet Research Steering Group
IRTF - Internet Research Task Force
IS - Information Separator
IS - Information Systems
IS - Intermediate System
IS - International Standard
IS - Interrupt Set
ISA - Industry-Standard Architecture
ISAM - Indexed Sequential Access Method
ISAS - Institute of Space and Astronautical Science (Japan)
ISBD - International Bibliographic Description
ISBN - International Standard Book Number
ISC - Information Services Center
ISC - Interactive Systems Corporation
ISC - International Switching Center
ISCH - Interstitial-Cell-Stimulating Hormone (same as LH)
ISDN - Integrated Services Digital Network
ISDT - Integrated Systems Development Tool
ISEE - International Sun Earth Explorer (usually ISEE-3)
ISF - Information Systems Factory
ISFUG - Integrated Software Federal User Group
ISH - Intermediate System Hello
ISI - Information Sciences Institute (at USC)
ISIS - Intermediate System to Intermediate System, "IS-IS"
ISLM - Integrated Services Line Module
ISLU - Integrated Services Line Unit
ISM - InterStellar Medium
ISN - Information Systems Network
ISN - Integrated Systems Network
ISO - Infrared Space Observatory
ISO - International Standards Organization
ISODE - ISO Development Environment
ISOO - Information Security Oversight Office
ISOP - Incentive Stock Option Plan
ISPM - International Solar Polar Mission
ISR - Institute of Snow Research
ISRG - Independent Space Research Group
ISS - Integrated Switching System
ISSI - Information Security Systems Inc.
ISSN - Integrated Special Services Network
ISSN - International Standard Serial Number
IST - Initial System Test
ISUP - Integrated Services User Part
ISV - Independent Software Vendor
ISV - Instantaneous Speed Variation
ISY - International Space Year
IT - Industrial Technology
IT - Information Technology
ITC - Independent Telephone Company
ITC - Inter-Task Communication
ITM - Information Technology Management
ITS - Incompatible Timesharing System
ITS - Institute of Telecommunication Science
ITSEC - Information Technology Security Evaluation Criteria
ITSO - Incoming Trunk Service Observation
ITT - International Telephone and Telegraph
ITU - International Telecommunications Union
ITUSA - IT Users Standards Association
IU - Integer Unit
IUE - International Ultraviolet Explorer
IUS - Inertial Upper Stage [Space]
IUV - Interlibrational Utility Vehicle [Space]
IVDT - Integrated Voice/Data Terminal
IVP - Installation Verification Program
IVTS - International Video Teleconferencing Service
IWBNI - It Would Be Nice If
IWC - Inside Wire Cable
IWS - Intelligent Work-Station
IWW - International Workers of the World
IX - Interactive eXecutive
IXC - IntereXchange Carrier (aka LD)
IXM - IntereXchange Mileage


JACM - Journal of the Association for Computing Machinery JAL - Japan Airline JANET - Joint Academic Network (U.K.) JBS - John Birch Society JC - Jesus Christ JC - Joint Compound (plumbing) JC - Julius Caesar JC - Junior College JCA - Jewelry Crafts Association JCAC - Joint Civil Affairs Committee JCAE - Joint Committee on Atomic Energy JCEE - Joint Council on Economic Education JCET - Joint Council on Educational Television JCL - Job Control Language JCS - Joint Chiefs of Staff JD - Justice Department JDS - John Dewey Society JECC - Japan Electronic Computer Company JEIDA - Japan Electronics Inderstry Development Association JEM - Japanese Experiment Module (for SSF) JES - Job Entry System JES - John Ericsson Society JESUS - Job Entry System of the University of Saskatuan JFET - Junction FET JFIF - JPEG File Interchange Format JFK - John F. Kennedy (and the international airport) JFMIP - Joint Financial Management Improvement Program JFS - Next Generation of JLE JGR - Journal of Geophysical Research JI - Justice, Inc. JIC - Joint Industry Council JIC - Joint Intelligence Center JIC - Just in Case JILA - Joint Institute for Laboratory Astrophysics JIM - Job Information Memorandum JINTACCS - Joint INteroperability of TActical Command and Control Systems JIS - Japan Industrial Standards JISC - Japanese Industrial Standards Committee JIT - Just In Time JLE - Japanese Language Enveronment JMS - John Milton Society JMX - Jumbogroup MultipleX JO - Job Order JO - Junior Officer JOAT - Jack Of All Trades JOVE - Jonathan's Own Version of Emacs JOVIAL - Jules Own Version of the International Algorithmic Language JPEG - Joint Photographic Experts Group JPL - Jet Propulsion Laboratory JRC - Junior Red Cross JSC - Johnson Space Center (NASA) JSD - Jackson System Development JSN - Junction Switch Number JSRC - Joint Services Review Committee JST - Japan Standard Time JSW - Junctor SWitch JTIDS - Joint Tactical Information Distribution Systems JTM - Job Transfer and Manipulation JUNET - Japan UNIX Network JV - Junior Varsity JVNC - John von Neumann (Super Computer) Center, "JvNC" JVNCNET - John von Neumann (Super Computer) Center network, "JvNCnet"


K - Kilobit K9 - canine (K9 corps - army dogs) KAO - Kuiper Airborne Observatory KAOS - Killing as Organized Sport KB - Key Board KB - KiloByte KBPS - KiloBits Per Second KBS - Knowledge-Based System KC - King's Counsel (QC when queen reigning) KC - Knights of Columbus KCL - Kyoto Common Lisp KD - Kiln Dried KD - Knocked Down; Knock-Down KDCI - Key Display Call Indicator KDD - Kokusai Denshin Denwa Co. KDT - Keyboard Display Terminal KERMIT - Kl-10 Error-free Reciprocal Micro Interconnect over Tty lines KFT - KiloFeeT KGB - Komitet Gosudarstvennoi Bezopaznosti KHz - Kilo HertZ (unit of frequency, 1000 cycles per second) KI - Kiwanis International KIA - Killed In Action KIAS - Knot Indicated Air Speed KIF - Key Index File KIP - Kinetics IP KIPS - Kawasaki Integrated Power-valve System KISS - Keep it simple, stupid KLIPS - thousands of Logical Inferences Per Second KLOC - thousands of Lines Of Code KO - Knock Out KOWC - Key Word Out of Context KP - Key Pulse [telephony] KP - Kitchen Police KPNO - Kitt Peak National Observatory KPO - KeyPunch Operator KQC - King's College London KR - Kernighan and Ritchie, the c programming language, "K&R" KS - King's Scholar KSC - Kennedy Space Center (NASA) KSF - Key Success Factor KSH - Korn SHell KSR - Keyboard Send-Receive KSU - Key System Unit [telephony] KTB - Cretaceous-Tertiary Boundary (from German) KTS - Key Telephone System [telephony] KTU - Key Telephone Unit [telephony] KWIC - Key Word In Context KY - Kentucky


L1 - Lagrange Point #1 35,000 Miles above moon [Space] L2 - Lagrange Point #2 40,000 Miles behind moon [Space] L3 - Lagrange Point #3 (?? 35,000 Miles below moon) [Space] L4 - Lagrange Point #4 240,000 mile Earth orbit [Space] L5 - Lagrange Point #5 240,000 mile Earth orbit [Space] LA - Los Angeles LA - Louisiana LA - Low Altitude LAB - Labor LAC - Loop Assignment Center LADAR - LAser Detection And Ranging LADT - Local Access Data Transport LAIS - Local Automatic Intercept System LAL - Local Analog Loopback LAM - Master of Liberal Arts LAMA - Local Automatic Message Accounting [telephony] LAN - Local Apparent Noon LAN - Local Area Network LANCE - Local Area Network Controller for Ethernet LANL - Los Alamos National Laboratory LAP - Link Access Procedure LAPB - Link Access Procedure - Balanced (X.25) LAPD - Link Access Procedure on the D channel LAPD - Los Angeles Police Department LAPM - Link Access Procedure for Modems LAR - Local Acquisition Radar LARC - Langley Research Center, "LaRC" [NASA] LASER - Light Amplification by Stimulated Emission of Radiation LASS - Local Area Signaling Service LAT - Local Apparent Time LAT - Local Area Transport (DEC) LATA - Local Access Transport Area LATIS - Loop Activity Tracking Information System LAVC - Local Area VAX Cluster LAX - Los Angeles International Airport LB - Light Bomber LB - pound (LiBra) LBHS - Long Beach High School LBL - Lawrence Berkeley Labs LBO - Line Buildout LBS - Load Balance System LBS - Pounds LC - Lower Case, "l.c." LC - inductor-Capacitor circuit (as in filters, L is symbol inductance) LCA - Logic Cell Array LCAMOS - Loop CAble Maintenance Operation System LCCIS - Local Common Channel Interoffice Signaling LCCL - Line Card CabLe LCCLN - Line Card Cable Narrative LCD - Liquid Crystal Display LCD - Lowest Common Denominator LCDN - Last Called Directory Number LCDR - Lieutenant Commander LCIE - Lightguide Cable Interconnection Equipment LCL - Lunar Cargo Lander [NASA OEXP] LCLOC - Line Card LOCation LCM - Life Cycle Management LCN - Logical Channel Numbers LCP - Link Control Protocol LCR - Least Cost Routing LCRMKR - Line Card ReMarKs, Retained LCS - Laboratory for Computer Science [MIT] LCSE - Line Card Service and Equipment LCSEN - Line Card Service and Equipment Narrative LCT - Landing Craft Tanks LDC - Logical Device Coordinates LDC - Long Distance Carrier [telephony] LDEF - Long Duration Exposure Facility LDF - Large Deployable Reflector [Space] LDL - Local Digital Loopback LDL - Low Density Lipoprotein LDMTS - Long Distance Message Telecommunications Service LDP - Laboratory Data Products LDS - The Church of Jesus Christ of Latter-Day Saints LDX - Long Distance eXtender [telephony] LE - Lance Ethernet LEAP - Low-power Enhanced At Portable LEAS - LATA Equal Access System LEC - Local Exchange Carrier [telephony] LED - Light-Emitting Diode LEGO - Low End Graphics Option LEM - Lunar Excursion Module (a.k.a. LM) (Apollo spacecraft) LENCL - Line Equipment Number CLass LEO - Low Earth Orbit [Space] LERC - Lewis Research Center, "LeRC" [NASA] LEST - Large Earth-based Solar Telescope LF - Line Feed Character LF - Line Finder LF - Low Frequency (30-300KHz) LFACS - Loop Facilties Assignment And Control System LFS - Loopback File System LFSA - List of Frequently Seen Acronyms LGA - Low Gain Antenna LGB - Lesbian/Gay/Bisexual LGB - Long Beach CA LGBO - Lesbian/Gay/Bisexual and any others we've missed, "LGBO*" LGM - Little Green Men LH - Left Hand LH - Liquid Hydrogen (also LH2 or LHX) LH - Lower Half LH - Luteinizing Hormone (same as ISCH) LHD - Litterarum Humaniorum Doctor (doctor of human letters) LHS - Left Hand Side LI - Long Island LIDAR - LIght Detection And Ranging LIFIA - Laboratoire d'Informatique Fondamentale et d'Intelligence Artificielle
LIFO - Last In, First Out
LIM - Lotus-Intel-Microsoft (memory specification)
LIMM - Lotus Intel Microsoft Memory (PC world)
LINC - Laboratory INstrument Computer
LIPS - Logical Inferences Per Second
LISA - Large Installation System Administration
LISP - LISt Processing Language
LIST - List-Oriented Interactive Language
LIU - Line Interface Unit
LJBF - Let's Just Be Friends
LL - Late Latin
LL - Long Lines [telephony]
LLAMA - Logic Lacking A Meaningful Acronym
LLB - Legum Baccalaureus (bachelor of laws)
LLC - Logical Link Control
LLCLINK - Layer Control Protocol (?), "LLCLink"
LLD - Legum doctor (doctor of laws)
LLN - Line Link Network [telephony]
LLNL - Lawrence-Livermore National Laboratory
LLO - Low Lunar Orbit [Space]
LLOX - Lunar Liquid OXygen [Space]
LLP - Line Link Pulsing [telephony]
LM - Lan Manager
LM - Life Master (Contract Bridge ranking)
LM - Lunar Module (a.k.a. LEM) (Apollo spacecraft)
LMC - Large Magellanic Cloud (see SMC)
LME - Layer Management Entity
LMF - License Management Facility
LMMS - Local Message Metering System
LMOS - Line Maintenance Operations System [telephony, AT&T]
LN2 - Liquid N2 (Nitrogen)
LNG - Liquified Natural Gas
LO - Lake Oswego
LO - Leverage Out
LOA - Lands of Adventure
LOA - Leave Of Absence
LOB - Line Of Balance
LOB - Line Of Building
LOC - Lines Of Code
LOC - Local Operating Company
LOCAP - LOw CAPacitance
LOE - Level Of Effort
LOF - Lock OFf-line
LOFT - Launch Operations Flight Test [Space]
LOI - Letter Of Intent
LON - Lock ON-line
LOOPS - Lisp Object Oriented Programming System
LOP - Lines Of Position
LORAN - Long RANge Navigation
LOS - Line Of Sight
LOS - Los Angeles
LOSF - Lunar Orbit Staging Facility [Space]
LOTS - Low Overhead Timesharing System
LOX - Liquid OXygen
LP - Linear Programming
LP - Long Play(ing) (record)
LP - Low Pressure
LPC - Linear Predictive Coding (speech processing)
LPCDF - Low Profile Combined Distributing Frame
LPDA - Link Problem Determination Aid
LPF - League for Programming Freedom
LPG - Liquified Petroleum Gas
LPG - Low Pressure Gas
LPL - Lunar Personnel Lander [NASA OEXP]
LPN - Licensed Practical Nurse
LPP - Licensed Program Products
LPR - Line PrinteR
LPT - Lunar Propellant Tanker [NASA OEXP]
LPV - Lunar Piloted Vehicle [NASA OEXP]
LRAP - Long Route Analysis Program
LRB - Liquid Rocket Booster [Space]
LRBM - Long Range Ballistic Missile
LRC - Longitudinal Redundancy Character
LRS - Line Repeater Station
LRSP - Long Range System Plan
LRSS - Long Range Switching Studies
LRU - Least Recently Used
LRU - Line Replaceable Unit
LS - Left Side
LS - Letter Signed
LS - Locus Sigilli (place of seal)
LSAP - Long Service Access Point
LSB - Least Significant Bit; Least Significant Byte
LSB - Lower Side Band
LSC - Lecture Series Committee [MIT]
LSC - LightSpeed C
LSD - Least Significant Digit
LSD - LySergic acid Diethylamide
LSD - pounds (Libra), shillings (Sestertii), and (old) pence (Denarii)
LSELLINK- Layer Selector (?), "LSELLink"
LSI - Large Scale Integration
LSP - LightSpeed Pascal
LSR - Local Standard of Rest
LSRP - Local Switching Replacement Planning system
LSS - Life Support System
LSS - Loop Switching System
LSSD - Level-Sensitive Scan Detection
LSV - Line Status Verifier
LT - Long Ton
LT - Low Tension
LTA - Lighter Than Air
LTAB - Line Test Access Bus
LTC - Lieutenant Colonel
LTC - Local Test Cabinet
LTD - Local Test Desk
LTF - Lightwave Terminating Frame
LTF - Line Trunk Frame
LTG - Line Trunk Group
LTJG - Lieutenant Junior Grade
LTL - Less than Truckload Lot
LTP - Lunar Transient Phenomenon
LTPD - Lot Tolerance Percent Deffective
LTS - Loss Test Set
LTV - Loan To Value
LTVR - LTV Ratio
LU - Logical Unit
LUG - Local Users Group
LUN - Logical Unit Number
LUT - Look-Up Table
LWM - Low-Water Mark
LWP - Light Weight Process
LWSP - Linear White-SPace
LWT - Last Will and Testament
LXE - Lightguide eXpress Entry
LZ - Landing Zone


M - Miniatures MA - Maintenance Administrator MA - Massachusetts [US state postal designation] MAAP - Maintenance And Administration Panel MAC - Mandatory Access Control MAC - Media Access Control MAC - Military Air Command MAC - Move, Add, Change MAC - Multiple Analogue Component MACBS - Multi-Access Cable Billing System MACSYMA - project MAC's SYmbolic MAnipulation System MAD - Mass Air Delivery MAD - Mutual Assured Destruction MADD - Mothers Against Drunk Driving MADN - Multiple Access Directory Numbers MAF - Marine Abkuerzungs Fimmel (roughly navy abbreviation spleen?) MAG - Magazine MAN - Metropolitan Area Network MAP - Maintenance and Administration Position MAP - Management Assesment Program MAP - Manufacturing Automation Protocol (GM's Token-Passing "Ethernet") MAP - Marketing Assistance Program MAPSS - Maintenance & Analysis Plan for Special Services MAPTOP - Manufacturing Automation Protocol/Technical Office Protocol, "MAP/TOP" MAR - Microprogram Address Register MARBI - MAchine Readable form of Bibliographic Information MARC - MAchine Readable card Catalog MARC - Market Analysis of Revenue and Customers system MARS - Multiuser Archival and Retrieval System MAS - MAin Store MAS - Mass Announcement System MASB - MAS Bus MASC - MAS Controller MASC - Multiple Award Schedule Contract MASER - Microwave Amplification by Stimulated Emission of Radiation MASH - Mobile Army Surgical Hospital MASM - MAS Memory MAST - Multi-Application SOnar Trainer MATCALS - Marine Air Traffic-Control And Landing System, "MAT-CALS" MATFAP - Metropolitan Area Transmission Facility Analysys Program MAU - Math Acceleration Unit MAU - Media Access Unit MAU - Medium Attachment Unit MAU - Multiple Access Unit MAU - Multistation Access Unit MAXI - Modular Architecture for the Exchange of Information (DoD) MB - Manned Base MB - MegaByte (1MB=1048576 bytes) MBA - Management Business Analyst MBA - Master Business Administration MBO - Management By Objectives MBPS - MegaBits/Bytes Per Second MBWA - Management By Walking Around MC - Management Committee MC - Master of Ceremonies MC - Material Control MCA - Mechanical Computer Aided Design MCA - Micro Channel Architecture MCAD - Mechanical Computer Aided Design MCAE - Mechanical Computer Aided Engineering MCC - Master Control Center MCC - Master Control Console MCC - Microelectronics & Computer Consortia (Austin based) MCC - Mission Control Center MCCS - Mechanized Calling Card Service MCH - Maintenance CHannel MCHB - Maintenance CHannel Buffer MCI - Media Control Interface MCI - Microwave Communications Incorporated MCIAS - Multi-Channel Intelligent/Intercept Announcement System MCN - Metropolitan Campus Network MCNC - Microelectronics Center of North Carolina MCP - Master Control Program MCP - Multiport/Multiprotocol Communication Processor MCPAS - Master Control Program/Advanced System, "MCP/AS" MCPO - Master Chief Petty Officer MCR - Memory ContRoller MCS - Material Control System MCS - Meeting Communications Service MCSV - Mars Crew Sortie Vehicle [NASA OEXP] MCTRAP - Mechanized Customer Trouble Report Analysis Plan MCU - Microprocessor Control Unit MD - Doctor of Medicine MD - Management Domain MD - Maryland [US state postal designation] MD - Medical Doctor MD - Months after Date MDACS - Modular Digital Access Control System MDAS - Magnetic Drum Auxiliary Sender MDC - Marker Distributor Control MDC - Meridian Digital Centrex MDDS - Media Documentation Distribution Set MDE - Modular Design Environment MDEC - MAINDEC maintenance on DEC diagnostic paper tapes MDF - Main Distribution Frame [telephony] MDI - Medium Dependent Interface MDQS - Multi-Device Queueing System MDRE - Mass Driver Reaction Engine [Space] MDS - Multi-point Distribution Service MDT - Mean Down Time
MDU - Marker Decoder Unit
MDX - Modular Digital eXchange
ME - Maine
ME - Mechanical Engineer
MEA - Minimum Enroute Altitude (IFR)
MEC - Mobile Equipment Console
MECO - Main Engine CutOff
MED - Master of EDucation, "MEd"
MELD - Mechanized Engineering and Layout for Distributing frames
MERP - Middle-Earth Role Playing
MERS - Most Economic Route Selection
MET - Mid European Time
MET - Multibutton Electronic Telephone
MF - Medium Frequency (300-3000KHz)
MF - Middle French
MF - Multi-Frequency [telephony]
MFA - Master Fine Arts
MFB - Monochrome Frame Buffer
MFENET - Magnetic Fusion Energy NETwork
MFG - Manufacturing
MFJ - Modification of Final Judgement
MFLOPS - Million FLoating-point OPerations per Second
MFM - Modified Frequency Modulation
MFR - Multi-Frequency Receivers
MFS - Macintosh File System
MFT - Metallic Facility Terminal
MFT - Multiprogramming with a Fixed number of Tasks
MG - Machine Gun
MG - Major General
MG - MasterGroup
MG - Military Government
MGH - Massachusetts General Hospital
MGM - Metro-Goldwyn Mayer [Corporate name]
MGT - MasterGroup Translator
MHD - MagnetoHydroDynamics
MHL - Microprocessor Host Loader
MHS - Message Handling System (aka X.400)
MHz - MegaHertZ (unit of frequency, 1,000,000 cycles per second)
MI - Michigan
MI - Military Intelligence
MI - Mode Indicator
MIA - Missing In Action
MIB - Management Information Base
MICE - Modular Integrated Communications Environment
MICR - Magnetic Ink Character Recognition
MIDI - Musical Instrument Digital Interface
MIF - Maker Interchange Format
MIFASS - Marine Integrated Fire And Support System
MIL - Military
MILNET - MILitary NETwork
MILSTD - MILitary StandarD, "MIL-STD"
MIM - Media Interface Module
MIM - Morality In Media
MIMD - Multiple Instruction, Multiple Data
MIME - Multipurpose Internet Mail Extensions
MIN - Mobile Identification Number
MINCE - MINCE Is Not Complete Emacs
MINX - Multimedia Information Network eXchange
MIP - Mortgage Insurance Premium
MIPS - Microprocessor without Interlocked Piped Stages
MIPS - Million Instructions Per Second
MIPS - Million of Instructions Per Second
MIR - Micro-Instruction Register
MIR - Peace, "mir" [Russian]
MIRS - Management Information Retrival System
MIRV - Multiple Independently-Targetable Reentry Vehicle
MIS - Management Information System
MISCF - MISCellaneous Frame
MIT - Massachusetts Institute of Technology
MITI - Ministry of International Trade and Industry
MITS - Microcomputer Interactive Test System
MJ - Modular Jack
MKTG - Marketing
ML - Middle Latin
MLA - Member of Legislative Assembly (see MPP)
MLC - MiniLine Card
MLCD - Multi-Line Call Detail
MLD - Minimum Lethal Dose
MLEM - Multi Language Environment
MLL - Mars Logistics Lander [NASA OEXP]
MLO - Material, Labor, Overhead - Inventoriable Cost / Full Cost
MLS - Microwave Landing System
MLS - MultiLevel Security
MLS - Multiple Listing Service
MLT - Mechanized Loop Testing
MLV - Medium Lift Vehicle [NASA OEXP]
MM - Maryknoll Missioners
MMC - Minicomputer Maintenance Center
MMC - Money Market Certificate
MMDF - Multi-channel Memo Distribution Facility
MMES - Martin Marietta Energy Systems
MMFS - Manufacturing Message Format Standard
MMGT - MultiMasterGroup Translator
MMH - MonoMethyl Hydrazine
MMJ - Modified Modular Jack
MMM - see 3M
MMOC - Minicomputer Maintenance Operations Center
MMP - Modified Modular Plug
MMS - Main Memory Status
MMS - Memory Management System
MMT - Multiple Mirror Telescope
MMU - Manned Maneuvering Unit [Space]
MMU - Memory Management Unit
MMW - Multi-Mega Watt [Space]
MMX - Mastergroup MultipleX
MN - Minnesota
MNA - Member of National Assembly (Quebec)
MNOS - Metal-Nitride-Oxide Semiconductor
MNP - Microcom Networking Protocol
MNRAS - Monthly Notices of the Royal Astronomical Society
MO - Magneto-Optical
MO - Mail Order
MO - Medical Officer
MO - Missouri
MO - Modus Operandi
MO - Money Order
MOA - Military Operations Area
MOC - Mars Observer Camera (on Mars Observer)
MOCA - Minimum Obstacle Clearance Altitude (IFR)
MOD - Magneto-Optical Disk
MOD - Mesio Occlusal Distal (dental filling)
MODEM - MOdulator-DEModulator
MOFW - Men Of Few Words
MOG - Minicomputer Operations Group
MOL - Manned Orbiting Laboratory
MOLA - Mars Observer Laser Altimeter (on Mars Observer)
MOMV - Manned Orbital Maneuvering Vehicle [Space]
MOP - Maintenance Operations Protocol (DEC)
MOR - Middle-Of-the-Road
MOS - Metal Oxide Semiconductor
MOSFET - Metal Oxide Semiconductor Field Effect Transistor
MOTAS - Member of the Appropriate Sex
MOTIS - Message-Oriented Text Interchange System
MOTOS - Member of the Opposite Sex
MOTSS - Member of the Same Sex
MOTV - Manned Orbital Transfer Vehicle [Space]
MOU - Memorandum Of Understanding
MOUSE - Minimum Orbital Unmanned Satellite of Earth
MOV - Metal Oxide Varistor
MP - Manifold Pressure
MP - Melting Point
MP - Member of Parliament
MP - Metal Particle
MP - Metropolitan Police
MP - Micro Processor
MP - Military Police(man)
MP - Mixed Projection
MP - Modular Plug
MP - MultiProcessing
MP - MultiProcessor
MPC - Minor Planets Circular
MPC - Multiprocess Communications
MPCC - Microprocessor Common Control
MPCH - Main Parallel CHannel
MPDU - Message Protocol Data Unit
MPE - Mission to Planet Earth [Space]
MPG - Miles Per Gallon
MPH - Miles Per Hour
MPIF - Multiprocessor Interface
MPO - Manufacturer's Point of Origin
MPOW - Multiple Purpose Operator Workstation
MPP - Member of Provincial Parliament (Canada; also MLA)
MPP - Message Posting Protocol
MPP - Message Processing Program
MPP - MicroProcessor Pascal
MPPD - Multi-Purpose Peripheral Device
MPR - Mars Pressurized Rover [Space]
MPS - Master Production Schedule
MPS - Megabytes Per Second
MPT - Ministry of Posts and Telecommunications
MPT - MultiPort Transceiver
MPU - MicroProcessor Unit
MPV - Mars Piloted Vehicle [NASA OEXP]
MPW - Macintosh Programmer's Workshop
MR - Miniatures Rules
MRD - Marketing Requirements Document
MRF - Maintenance Reset Function
MRFL - Mandatory File and Record Locking
MRI - Magnetic Resonance Imaging
MRP - Manufacturing Requirements Planning
MRP - Manufacturing Resource Planning
MRP - Material Resource Planning
MRS - Material Reject Stock
MRS - Material Requirements Schedule
MRSR - Mars Rover and Sample Return
MRSRM - Mars Rover and Sample Return Mission
MRTS - Modification Request Tracking System
MRU - Most Recently Used
MS - Maintenance State
MS - ManuScript
MS - Master of Science
MS - Military Science
MS - MilliSecond
MS - Motor Ship
MS - Multiple Sclerosis
MSB - Most Significant Bit; Most Significant Byte
MSC - Media Stimulated Calling
MSC - MicroSoft C
MSCDEX - MicroSoft CD-rom EXtensions
MSCP - Mass Storage Control Protocol
MSD - Most Significant Digit
MSDOS - MicroSoft DOS, "MS-DOS", Maybe SomeDay an Operating System
MSE - Mobile Subscriber Equipment
MSFC - (George C.) Marshall Space Flight Center [NASA]
MSFR - Minimum Security Functionality Requirements
MSG - MonoSodium Glutamate
MSH - Marvel Super Heroes
MSI - Medium Scale Integration
MSL - Mean Sea Level
MSL - Motor Simulation Laboratory
MSN - Manufacturing Sequence Number
MSN - Manhattan Street Network, mesh architecture - wavelength-division mux
MSO - Manufacturers Statement of Ownership
MSP - Mass Storage Pedestal
MSPE - Mercenaries, Spies & Private Eyes
MSR - Multitrack Serpentine Recording
MSS - Management Support System
MSS - ManuScriptS
MSS - Mass Storage Subsystem
MSS - Mass Storage System
MSS - Maximum Segment Size
MST - Mountain Standard Time
MT - Material Transfer
MT - Metric Ton
MT - Mountain Time
MTA - Mail Transfer Agent
MTA - Message Transfer Agent
MTA - Message Transfer Architecture (AT&T)
MTA - Metropolitan Transportation Authority
MTBF - Mean Time Between Failures
MTBRP - Mean-Time-Between-Parts-Replacement
MTC - Man Tended Capability
MTD - Month To Date
MTF - Master Test Frame
MTF - Modulation Transfer Function
MTI - Multi-Terminal Interface
MTM - Method Time Measurements
MTP - Message Transfer Part
MTR - Magnetic Tape Recording
MTR - Mechanized Time Reporting
MTS - Message Telecommunications Service
MTS - Message Telephone Service
MTS - Mobile Telephone Service
MTSO - Mobile Telephone Switching Office [telephony]
MTTF - Mean Time To Failure
MTTFF - Mean Time To First Failure
MTTR - Mean Time To Repair
MTTR - Mean Time Trouble Repair
MTU - Maintenance Termination Unit
MTU - Maximum Transer Unit
MTU - Maximum Transmission Unit
MTU - Media Tech Unit
MTV - Music TeleVision
MTX - Mobile Telephone eXchange
MU - Message Unit
MUA - Mail User Agent
MUF - Maximum Usable Frequency (max freq during sunspot activity)
MULDEM - MULtiplexer-DEMultiplexer
MULTICS - MULTiplexed Information and Computing Service
MUMPS - Massachusetts general hospital Utility MultiProgramming System
MUNG - Mung Until No Good (see the hacker's dictionary)
MUX - MUltipleXor
MV - MicroVAX
MVA - Market Value Adjustment
MVA - MegaVolt Ampere
MVP - Multiline Variety Package
MVS - Multiple Virtual Storage
MVSSP - Multiple Virtual Storage / System Product, "MVS/SP"
MVSXA - Multiple Virtual Storage / Extended Architecture, "MVS/XA"
MVY - Martha's Vineyard MA
MW - MicroWave, "M/W"
MW - MultiWink
MWM - Motif Window Manager
MX - Mail eXchange
MX - Missile eXperimental
MXU - MultipleXer Unit
MeV - Million Electron Volts


N - North N - Notice NA - Narcotics Anonymous NA - Next Address NA - North America NA - Not Applicable NAACP - National Association for the Advancement of Colored People NAAS - North American Automated Systems co. NAB - National Association of Broadcasters NABISCO - NAtional BIScuit COmpany [Corporate name] NAC - Network Administration Center NACA - National Advisory Committee on Aeronautics (became NASA) NACS - National Advisory Committee on Semiconductors NAD - Network Access Device NADGE - NATO Air Defense Ground Environment NAG - Network Architecture Group NAG - Numerical Algorithms Group NAGE - National Association of Government Employees NAK - Negative AcKnowledgement NAM - Name and Address Module [telephony, cellular phone changeable ROM] NAM - National Account Manager [telephony, AT&T specific?] NAM - Number Assignment Module [telephony, cellular phone changeable ROM] NAMM - North American Music Merchants NAND - Inverted And Gate, Not And NAND - Not-AND gate NANP - North American Numbering Plan NAPAP - National Acid Precipitation Assessment Program NAPLPS - North American Presentation Layer Protocol Suite NAR - National Association of Realtors NAR - Nuclear Acoustic Resonance NARDAC - NAvy Regional Data Automation Center NAS - National Academy of Sciences NAS - National Advanced Systems NAS - National Aircraft (Aerospace) Standards NAS - National Audubon Society NAS - Network Application Support NAS - Numerical Aerodynamic Simulation NAS - Numerical and Atmospheric Sciences network NASA - National Aeronautics and Space Administration NASAGSFC - National Aeronautics and Space Administration Goddard Space Flight Center, "NASA/GSFC" NASCAR - National Association of Stock Car Auto Racing NASDA - National Space Development Agency [Japan] NASDAQ - National Association of Security Dealers Automated Quotations NASM - National Air and Space Museum NASP - National AeroSpace Plane NATO - North Atlantic Treaty Organization NAU - Network Addressable Unit NAVDAC - NAVal Data Automation Command NAVSWC - NAV Surface Warfare/Weapons Center NB - New Brunswick NB - Nota Bene NBA - National Basketball Association NBC - National Broadcasting Company NBFM - NarrowBand Frequency Modulation NBO - Network Build Out NBO - Network Business Opportunity NBP - Name Binding Protocol NBS - National Bureau of Standards (renamed NIST) [U.S. Government] NBVM - Narrow Band Voice Modulation NC - Network Control NC - No Charge NC - No Connection NC - North Carolina NCA - Network Control Analysis NCAR - National Center for Atmospheric Research NCC - National Computer Conference NCC - Network Control Center NCCF - Network Communications Control Facility NCD - Network Computing Devices NCDC - National Climatic Data Center NCE - New Catholic Edition NCGA - National Computer Graphics Association NCIC - National Cartographic Information Center NCIC - National Crime Information Center NCMOS - N-Channel (Silicon Gate Reversed) CMOS NCO - Non-Commissioned Officer NCP - Network Control Program/Protocol/Point NCR - National Cash Register [Corporate name] NCS - National Computer/Communications Systems NCS - Network Computing System NCSA - National Center for Supercomputing Applications NCSC - National Computer Security Center NCSL - National Computer Systems Laboratory (NIST) NCTE - Network Channel-Terminating Equipment NCTL - National Computer and Telecommunications Laboratory NCV - No Commercial Value ND - Network Disk (Sun) ND - No Date ND - North Dakota NDA - Non-Disclosure Agreement NDB - Non-Directional Beacon NDCC - Network Data Collection Center NDDL - Neutral Data Definition Language NDE - NeWS Development Environment NDEA - National Defense Education Act NDI - Network Design & Installation (Sun Service), "ND&I" NDIS - Network Driver Interface Specification
NDL - Logical Network Disk
NDL - Network Database Language
NDP - New Democratic Party (Canada)
NDSL - National Direct Student Loan
NDT - Newfoundland Daylight Time
NDV - NASP Derived Vehicle
NE - New England
NE - Non Exempt
NE - North East
NEAR - National Electronic Accounting and Reporting system
NEARNET - New England Academic and Research network, "NEARnet"
NEB - New English Bible
NEBS - New Equipment-Building System
NEC - National Electric Code
NEC - National Electric Conference
NEC - Nippon Electric Company [Corporate name]
NEFS - Network extensible File System, "NeFS"
NEI - Not Elsewhere Included
NEMA - National Electrical Manufacturers Association
NEMP - Nuclear ElectroMagnetic Pulse
NES - National Energy Strategy
NES - Not Elsewhere Specified
NESAC - National Electronic Switching Assistance Center
NESC - National Energy Software Center
NET - NETwork
NET - National Educational Television
NET - New England Telephone
NETBIOS - NETwork Basic Input Output System
NETBLT - NETwork Block Transfer
NETCDF - NETwork Common Data Format
NEWS - Network extensible Window System
NEWS - Networked extensible Windowing System, "NeWS"
NEWT - NeWS Terminal, "NeWT"
NEXRAD - NEXt generation weather RADar
NEXT - Near-End cross-Talk
NF - No Funds
NFC - National Football Conference
NFFE - National Federation of Federal Employees
NFL - National Football League
NFPA - National Fire Protection Association
NFR - Not a Functional Requirement
NFS - Network File System
NFT - Network File Transfer
NG - National Guard
NG - No Good
NGC - New General Catalog
NH - New Hampshire
NHI - National Health Insurance
NHL - National Hockey League (the nation is Canada)
NHLBI - National Heart, Lung, and Blood Institute (Bethesda, MD)
NHR - Non Hierarchial Routing
NI - Network Interface
NIC - Network Information Center (ARPAnet)
NIC - Network Interface Card
NICE - Network Information and Control Exchange (DECNET)
NICMOS - Near Infrared Camera / Multi Object Spectrometer (HST upgrade)
NIFTP - (a file transfer network in the UK)
NIH - National Institutes of Health
NIH - Not Invented Here
NIM - Nuclear Instrumentation Module (an electronic instr. standard)
NIMBY - Not In My Back Yard
NIMH - National Institute of Mental Health (Rockville, MD)
NIMS - Near-Infrared Mapping Spectrometer (on Galileo)
NIR - Near InfraRed
NIR - Network Information Registry
NIS - Network Information Service (nee YP)
NISC - Network Information and Support Center (NYSERNet)
NISDN - narrowband integrated-services digital network, "N_ISDN"
NISO - National Information Standards Organization
NIST - National Institute of Standards and Technology (formerly NBS)
NIU - Network Interface Unit
NJ - New Jersey
NKS - Network Knowledge Server
NL - National League (baseball)
NLDP - National Launch Development Program
NLM - National Library of Medicine
NLP - Natural Language Processing
NLRB - National Labor Relations Board
NLS - Native Language Support
NLS - Network License Server
NM - Nautical Mile
NM - Network Module
NM - New Mexico
NM - Night Message
NM - No Mark; Not Marked
NMC - Network Management Center
NMI - New Model Introduction
NMI - Non Maskable Interrupt
NMOS - N channel Metal Oxide Semiconductor (N-MOS) (see MOS)
NMR - Nuclear Magnetic Resonance
NMS - Network Management Station
NNE - North North East
NNTP - Net News Transfer Protocol
NNTP - Network News Transfer Protocol
NNW - North North West
NNX - Network Numbering eXchange
NOAA - National Oceanic and Atmospheric Administration
NOAO - National Optical Astronomy Observatories
NOC - Network Operations Center
NOCS - Network Operations Center System
NOP - No OPeration
NORAD - NORth American Defense command
NORDO - No-radio
NORGEN - Network Operations Report GENerator
NORML - National Organization for the Reform of Marijuana Laws
NOS - Network Operating System
NOS - Not Otherwise Specified
NOSC - Naval Ocean Systems Center
NOTIS - Network Operator Trouble Information System
NP - No Protest
NP - Nondeterministic-Polynomial
NP - Notary Public
NP - Noun Phrase
NPA - No Power Alarm
NPA - Numbering Plan Area, or area code [Telephony]
NPC - Non-Player Character (see PC)
NPG - New Product Group
NPI - New Product Introduction
NPL - National Physical Laboratory (UK)
NPL - Non-Procedural Language
NPN - Negative-Positive-Negative (transistor)
NPN - NonProtein Nitrogen
NPP - Net Primary Productivity
NPR - National Public Radio
NPRM - Notice of Proposed Rulemaking
NPSI - Network Protocol Service Interface
NPV - Net Present Value
NQ - No Quote
NQS - Network Queuing System
NRA - National Rifle Association
NRAO - National Radio Astronomy Observatory
NRC - National Research Council
NRC - Nuclear Regulatory Commission
NRDC - Natural Resource Defense Council
NRE - Non-Recurring Engineering
NREN - National Research and Education Network
NRL - Naval Research Labs
NRM - Normal Response Mode
NRO - National Reconnaissance Office
NRZ - Non-Return to Zero
NRZI - Non-Return to Zero Inverted (magnetic tape, 800 bpi)
NS - Name Server
NS - Network Services
NS - Neutron Star
NS - Not Specified
NS - Nova Scotia
NS - Nuclear Ship
NSA - National Security Agency [U.S. Government]
NSAP - Network Service Access Point
NSC - National Security Council [U.S. Government]
NSC - Network Service Center
NSCS - Network Service Center System
NSDSSO - NASA Science Data Systems Standards Office
NSE - Network Software Environment
NSEC - Network Switching Engineering Center
NSEL - Network Service Selector
NSEM - Network Software Environment
NSF - National Science Foundation [U.S. Government]
NSFNET - National Science Foundation NETwork
NSO - National Solar Observatory
NSP - Network Services Protocol (DECNET)
NSPMP - Network Switching Performance Measurement Plan
NSSDC - National Space Science Data Center
NST - Newfoundland Standard Time
NSTS - National Space Transportation System [Space]
NSU - Networking Support Utilities
NSUG - Nihon Sun User's Group
NSW - New South Wales (Australia)
NSWC - Naval Surface Warfare/Weapons (obsolete) Center
NT - Network Termination
NT - New Testament
NT - Newfoundland Time
NT - Northern Telecom
NT - Northern Territory
NTEC - Network Technical Equipment Center
NTEU - National Treasury Employees Union
NTF - No Trouble Found
NTIA - National Telecommunications and Information Agency
NTIS - National Technical Information Service
NTN - Neutralized Twisted Nematic
NTO - Network Terminal Option
NTP - Network Time Protocol
NTP - Normal Temperature and Pressure (see STP)
NTR - Nuclear Thermal Rocket(ry)
NTS - Network Technical Support
NTS - Network Test System
NTSB - National Transportation Safety Board [U.S. Government]
NTSC - National Television Standards Committee; Never The Same Color
NTT - New Technology Telescope
NTT - Nippon Telephone & Telegraph
NU - Name Unknown
NUA - Network User Address
NUI - Network User Identification
NURBS - NonUniform Rational B-Spline
NUSC - Naval Underwater Systems Command
NV - Nevada
NVH - Noise, Vibration, Harshness
NVLAP - National Validation Laboratory Program
NVRAM - NonVolatile Random Access Memory
NW - North West
NWA - Northwest Airline
NWS - National Weather Service
NWT - North West Territories (Australia)
NXX - NANP syntax for a three-digit string, {[2-9],[0-9],[0-9]} [Telephony]
NY - New York
NYC - New York City
NYNEX - New York, New England and the unknown (X)
NYSE - New York Stock Exchange
NYSERNET - New York State Educational and Research Network, "NYSERNet"
NZ - New Zealand
NZUSUGI - New Zealand Unix System User Group, Inc.


O2 - Oxygen OA - Office Automation OA - Order Administration OA - Overeaters Anonymous OACIS - Oregon Advanced Computing InStitute OAK - Oakland CA OAO - Orbiting Astronomical Observatory OAS - Organization of American States OASYS - Office Automation SYStem OAT - Outside Air Temperature OATS - Office Automation Technology and Services OB - Obligatory OBD - Online Bugs Database (Sun) OBE - Order of the British Empire OBO - Or Best Offer OBS - Omni Bearing Selector OBS - Omnibearing Selector OC - Operator Centralization OC - Order of Canada OCATE - Oregon Center for Advanced Technology Education OCC - Office Communications Cabinet OCC - Other Common Carrier OCDM - Office of Civil Defense and Mobilization OCE - Other Common carrier channel Equipment OCI - Out of City Indicator OCLC - Online Computer Library Center (Ohio College Library Catalog) OCLI - Optical Coating Labs Inc. OCO - Object Code Only OCR - Optical Character Reader OCR - Optical Character Recognition OCS - Officer Candidate School OCST - Office of Commercial Space Transportation OCU - Office Channel Unit OD - Doctor of Optometry OD - Oculus Dexter (right eye) OD - Officer of the Day OD - Outer Diameter OD - OverDose ODA - Office Document Architecture ODAC - Operations Distribution Administration Center ODD - Operator Distance Dialing ODDD - Operator Direct Distance Dialing ODI - Optical Digital Image ODIF - Ofice Document Interchange Format ODISS - Optical Digital Image Storage System ODS - Overhead Data Stream OE - Old English OE - Order Entry OECD - Organization for Economic Cooperation and Development OED - Oxford English Dictionary OEM - Original Equipment Manufacturer OEO - Office of Economic Opportunity OES - Order of the Eastern Star OEXP - Office of Exploration [NASA] OF - Old French OFM - Order of Friars Minor OFNPS - Outstate Facility Network Planning System OFS - Order of Free State OG - Original Gum OGI - Oregon Graduate Institute OGICSE - Oregon Graduate Institute Computer Science and Engineering OGT - OutGoing Trunk OH - Ohio OH - OverHead OHP - OverHead Projector OIRA - Office of Information and Regulatory Affairs OIU - Office Interface Unit OIW - Workshop for Implementors of OSI OJT - On-the-Job Training OLIT - Open Look Interface Toolkit OLTM - Optical Line Terminating Multiplexer, "O-LTM" OLTP - OnLine Transaction Processing OLWM - OpenLook Window Manager OM - Office Management OMB - Office of Management and Budget OMD - Orchestral Manouevers in the Dark OME - Oregon Microcomputer Engineering (Intel) OMM - Output Message Manual OMPF - Operation and Maintenance Processor Frame OMS - Orbital Maneuvering System OMV - Orbital Maneuvering Vehicle [Space] ON - Old Norse ONA - Open Network Architecture ONAC - Operations Network Administration Center ONAL - Off Network Access Line ONC - Open Network Computing ONI - Office of Naval Intelligence ONI - Operator Number Identification [telephony] ONR - Office of Naval Research OO - Object Oriented OOB - Out Of Band OODB - Object Oriented Data Base OOP - Object-Oriented Programming OOPART - Out Of Place ARTifact OOPL - Object-Oriented Programming Language OOPS - Object Oriented Program Support OOPS - Object-Oriented Programming System OOPSTAD - Object Oriented Programming for Smalltalk Application Developers Association OOSH - Object-Oriented SHell OOT - Object-Oriented Technology OP - OFFICEPOWER office automation system, trademark of CCI OP - Observation Post OP - OfficePower office automation system, trademark of CCI OP - Order of Preachers OP - Out of Print OP - Outside Plant OPC - Originating Point Codes OPDU - Operation Protocol Data Units OPEC - Organization of Petroleum Exporting Countries OPEOS - Outside Plant planning, Engineering & construction Operations Sys OPF - Orbiter Processing Facility OPM - Office of Personnel Management OPM - Outside Plant Module OPS - Off-Premises Station OPSM - Outside Plant Subscriber Module OPX - Off-Premises eXtension OR - Operating Room OR - Operation Research OR - Oregon OR - Originating Register OR - Owner's Risk, Own Risk ORB - Office Repeater Bay ORDLIX - Organized Design for Line and Crew System ORFEUS - Orbiting and Retrievable Far and Extreme Ultraviolet Spectrometer ORM - Optical Remote Module ORNAME - Originator / Recipient Name, "ORname" ORNL - Oak Ridge National Laboratory OROM - Optical Read Only Memory ORT - Ongoing Reliability Test OS - Oculus Sinister (left eye) OS - Operating System OS - Operator Service OS - Ordinary Seaman OS - Out of Stock OS - OutState OS2 - Operating System/2, "OS/2" OSAC - Operator Services Assistance Center OSB - Order of St. Benedict OSC - OSCillator OSC - Operator Services Center OSC - Orbital Sciences Corporation [Space] OSCAR - Orbiting Satellite Carrying Amateur Radio OSCRL - Operating System Command Response Language OSD - Office of the Secretary of Defense OSDIT - Office of Software Development and Information Technology OSDS - Operating System for Distributed Switching OSF - Open Software Foundation (Oppose Sun Forever) OSF - Order of St. Francis OSHA - Occupational Safety and Health Act OSI - Open Systems Interconnection OSINET - Open Systems Interconnection Network OSIRM - Open Systems Interconnection/Reference Model, "OSI/RM" OSME - Open Systems Message Exchange OSN - Office Systems Node OSN - Open Systems Network OSO - Originating Signaling Office OSP - Optical Storage Processor OSP - OutSide Plant OSPF - Open Shortest Path First OSPS - Operator Service Position System OSS - Office Support System OSS - Office of Strategic Services (later CIA) OSS - Operation Support System [telephony, AT&T?] OSS - Operator Service System OSSA - Office of Space Science and Applications OSSE - Oriented Scintillation Spectrometer Experiment (on GRO) OSTP - Office of Science and Technology Policy [White House] OT - Old Testament OT - OverTime OTA - Office of Technology Assessment [U.S. government] OTA - Optical Telescope Assembly (on HST) OTB - Off-Track Betting OTBS - One True Bracketing Style OTC - Output Technology Corporation OTC - Over The Counter (stocks) OTDR - Optical TDR OTEC - Ocean Thermal Energy Conversion OTF - Open Token Foundation OTHB - Over The Horizon - Backscatter (as in radar), "OTH-B" OTL - Out To Lunch OTLF - Open Taxi & Limousine Foundation, "OT&LF" OTM - On Time Marker OTOH - On The Other Hand OTR - On The Rag OTS - Off The Shelf OTS - Office of Thrift Supervision OTS - Officers' Training School OTV - Orbital Transfer Vehicle [Space] OUTWATS - OUTward Wide Area Telephone Service [telephony] OV - Orbiter Vehicle [Space] OW - Over-Write OWHN - One-Word Host Name


P - (Chem.) para-, "p-" P - (UK) pence, pennies, penny, "p" P - page, "p." P - per (as in m.p.h.), "p." P - peta- (SI prefix) P - phosphorus, "P" P - pico- (SI prefix), "p" P2 - Interpersonal Messaging Protocol (for heading and body) P3 - Protocol used by UA Entities and MTA Entities P4 - The video interface bus on the 3/80 PA - Pennsylvania PA - Per Annum PA - Play Aid PA - Power Alarm PA - Power of Attorney PA - Precision Architecture (HP) PA - Press Agent PA - Private Account PA - Process Alert PA - Program Address PA - Public Address PA - Purchasing Agent PA - protactinium, "Pa" PABX - Private Automatic Branch eXchange [telephony] PACE - Program for Arrangement of Cables and Equipment PACT - Prefix Access Code Translator PACX - Private Automatic Computer eXchange PAD - Packet Assembler-Disassembler (for networking) PAD - Public Access Device (networking) PAK - Product Authorization Key PAL - Personal Answer Line (Sun group) PAL - Phase Alternation Line-rate PAL - Programmable Array Logic PAM - Payload Assist Module [Space] PAM - Pulse Amplification Modulation PAM - Pulse-Amplitude Modulation PAMD - Payload Assist Module, Delta-class, "PAM-D" PAN - Personal Account Number PANS - Pretty Advanced New Stuff PAO - Palo Alto CA PAP - Printer Access Protocol PAR - Peak-to-Average Ratio, "P/AR" PAR - Precision Approach Radar PAR - Project Authorization Request PARC - Palo Alto Research Center, xerox PAS - Public Announcement Service PAT - Power Alarm Test PAT - Profit After Tax PATROL - Program for Administrative Traffic Reports On Line PAX - Private Automatic eXchange PBC - Peripheral Bus Computer PBC - Processor Bus Controller PBD - Pacific Bell Directory PBM - Play By Mail game PBS - Public Broadcasting System PBT - Profit Before TAX PBX - Private Branch eXchange [telephony] PC - Peace Corps PC - PerCent; PerCentage PC - Personal Computer PC - Piece of Crap PC - Player Character (see NPC) PC - Politically Correct PC - Post Card PC - Post Cibum (after meals) PC - Primary Center PC - Printed Circuit PC - Privileged Character PC - Privy Council PC - Production Control PC - Program Counter PC - Progressive Conservative party (Canada) PCA - Positive Controlled Airspace (above 18,000') PCA - Printed-Circuit Assembly PCAT - Personal Computer/Advanced Technology, "PC/AT" PCB - PolyChlorinated Biphenyls PCB - Printed Circuit Board PCB - Process Control Block PCB - Protocol Control Block (TCP) PCC - Portable C Compiler PCDA - Program Controlled Data Acquisition PCDOS - Personal Computer DOS, "PC-DOS" PCF - Portable Compiled Font PCH - Parallel CHannel PCI - Panel Call Indicator PCI - Protocol Control Information PCIE - President's Council on Integrity and Efficiency PCL - Printer Command Language PCL - Programmable Command Language PCM - Plug-Compatible Mainframe PCM - Pulse-Code Modulation PCN - Personal Communication Network PCNFS - Personal Computer Network File System PCO - Peg Count and Overflow PCO - Process Change Order PCPC - Personal Computers Peripheral Corporation PCS - Patchable Control Store PCS - Permanent Change of Station PCSA - Personal Computer Systems Architecture PCTE - Portable Common Tools Environment PCTS - Posix Conformance Test Suite PCTV - Program Controlled TransVerters PD - Per Diem PD - Peripheral Decoder PD - Police Department PD - Potential Difference PD - Public Domain PDAD - Proposed Draft ADdendum PDE - Partial Differential Equation PDES - Product Data Exchange Specifications PDF - Power Distribution Frame PDF - Program Development Facility PDI - Power and Data Interface PDL - Page Description Language PDL - Page/Program Description/Design Language
PDL - Program Design Language
PDN - Public Data Network
PDP - Plasma Display Panel
PDP - Programmed Data Processor [DEC]
PDQ - Pretty Damned Quick
PDS - Portable Display Shell
PDS - Premises Distribution System (AT&T)
PDS - Public Domain Software
PDSP - Peripheral Data Storage Processor
PDT - Pacific Daylight Time
PDU - Product Development Unit
PDU - Protocol Data Unit
PE - Peripheral Equipment
PE - Phase Encoded (1600 bpi)
PE - Physical Education
PE - PolyEthylene
PE - Prince Edward island
PE - Printer's Error
PE - Professional Engineer
PE - Protestant Episcopal
PECC - Product Engineering Control Center
PEI - Prince Edward Island
PEM - Privacy Enhanced Mail
PEP - Packetized Ensemble Protocol
PEP - Productivity Enhancement Project
PEPE - Pepe Est Presque Emacs
PERFECT - PERFormance Evaluation for Cost-Effective Transformations
PERL - Pathologically Eclectic Rubbish Lister
PERL - Practical Extraction and Report Language
PERT - Program Evalution and Review Technique
PETA - People for the Ethical Treatment of Animals
PEX - Phigs/phigs+ Extension to X
PEXSI - PEX Sample Implementation (gfx), "PEX-SI"
PF - Programmed Function
PFB - Printer Font Binary
PFPU - Processor Frame Power Unit
PG - Perge Notice
PGA - Pin Grid Array
PGA - Professional Graphics Adapter
PGA - Pure Grain Alcohol
PH - Parity High bit
PH - Potential of Hydrogen, "pH"
PH - Process Hold
PHA - Pulse Height Analyzer/Analysis
PHIGS - Programmer's Hierarchical Interactive Graphics System
PHOTOCD - PHOTOgraphic Compact Disk
PHS - Public Health Service
PHYSREV - Physical Review Journal, "PhysRev"
PI - Principal Investigator
PI - Protocol Interpreter
PIA - Plug-In Administrator
PIC - Pilot In Command
PIC - Plastic-Insulated Cable
PIC - Primary Independent Carrier
PICS - Plug-in Inventory Control System (PICS/DCPR)
PID - Process IDentifier
PID - Protocol IDentifier
PIF - Paid In Full
PIMS - Profit Impact of Marketing Strategy
PIN - Personal Identification Number
PINE - Pine Is Not Elm
PING - Packet INternet Groper
PING - Packet InterNet Grouper
PIP - Packet Interface Port
PIP - Periphal Interchange Program
PIT - Principal, Interest, and Taxes
PITI - Principal, Interest, Taxes, Insurance
PIXEL - PIcture ELement
PL - Parity Low bit
PL1 - Programming Language One, "PL/1"
PLA - Programmable Logic Array
PLAN - Public Lands Action Network
PLC - Programmable Logic Controller
PLCC - Plastic Leaded Chip Carrier
PLD - Programmable Logic Device
PLL - Phase-Locked Loop
PLM - Programming Language for Microcomputers
PLO - Palestine Liberation Organization
PLO - Please Leave On
PLS - Physical Layer Signaling
PLSS - Portable Life Support System
PLT - Panduit Locking Tie
PM - PayMaster
PM - Peripheral Module
PM - Phase Modulation
PM - Plant Management
PM - Police Magistrate
PM - Post Meridiem (after noon)
PM - PostMaster
PM - PostMortem
PM - Presentation Manager
PM - Pressurized Module
PM - Preventive Maintenance
PM - Prime Minister
PM - Provost Marshal
PMA - Physical Medium Attachment
PMAC - Peripheral Module Access Controller
PMC - Permanently Manned Capability
PMDF - Pascal Memo Distribution Facility
PMEG - Page Map Entry Group
PMG - Page Map Group
PMIRR - Pressure Modulated InfraRed Radiometer (on Mars Observer)
PMO - Prime Minister's Office
PMOS - P channel Metal Oxide Semiconductor (P-MOS) (see MOS)
PMRC - Parents' Music Resource Center
PMT - PhotoMultiplier Tube
PMU - Precision Measurement Unit
PMX - Presentation Manager for the X window system, "PM/X"
PN - Part Number
PN - Promissory Note
PNB - Pacific Northwest Bell
PNP - Plug N Play
PNP - Positive-Negative-Positive (transistor)
PNPN - Positive-Negative-Positive-Negative devices
PO - Petty Officer
PO - Post Office
PO - Postal Order
PO - Purchase Order
POB - Periphal Order Buffer
POC - Port Of Call
POD - Pay On Delivery
POD - Point Of Distribution
POE - Port Of Entry/Embarkation
POF - Programmable Operator Facility
POGO - Polar Orbiting Geophysical Observatory
POH - Pilot's Operating Handbook
POK - Power on Okey Signal
POM - Phase Of Moon
POP - Point Of Production
POP - Point of Presence [telephony]
POP - Post Office Protocol
POP - Processor On Plug-in (h/w)
POPS - Paperless Order Processing System
POR - Point Of Receive
POR - Price On Request
POS - Point Of Sale
POSI - Promoting conference for OSI
POSIX - Portable Operating System for unIX
POSYBL - PrOgramming SYstem for distriButed appLications
POTS - Plain Old Telephone Service
POTS - Plain Ordinary Telephone System
POTV - Personnel Orbit Transfer Vehicle [Space]
POV - Point Of View
POW - Prisoner Of War
POWER - Performance Optimization With Enhanced Risc
PP - Painting Processor
PP - Parcel Post
PP - Past Participle
PP - Post Pay
PP - Primary Point
PP - Private Pilot
PP - pages, "pp."
PPA - Post Pack Audit
PPB - Parts Per Billion
PPBS - Planning, Programming, and Budgeting Systems
PPC - Pour Prendre Conge' (to take leave)
PPCS - Person to Person, Collect, Special [telephony]
PPD - Peripheral Pulse Distributor
PPD - PostScript Printer Description
PPI - Professional Press Inc.
PPM - Page Per Minute
PPM - Parts Per Million
PPM - Product Portfolio Management
PPN - Parameterized Post-Newtonian formalism for general relativity
PPN - Project Programmer Number
PPN - Public Packet Switching
PPP - Point-to-Point Protocol
PPS - PostPostScriptum
PPS - Product Performance Surveys
PPS - Public Packet Switching network
PPT - Parts Per Trillion
PPT - Pulse Pair Timing
PPT - Punched Paper Tape
PQ - Province of Quebec
PR - PayRoll
PR - Public Relations
PR - Puerto Rico
PRC - People's Republic of China
PRC - Planning Research Corporation
PRCA - Puerto Rico Communications Authority
PREMIS - PREMises Information System
PREPNET - Pennsylvania Research & Economic Partnership network, "PREPnet"
PRG - PAL/PROM Programming Department
PRI - Primary Rate Interface
PRISM - Parallel Reduced Instruction Set Multiprocessing
PRMD - Private Management Domain
PROFS - PRofessional OFfice System
PROLOG - PROgramming in LOGic
PROM - Programmable Read-Only Memory
PROMATS - PROgrammable Magnetic Tape System
PROPAL - Programmed PAL
PROTEL - PRocedure Oriented Type Enforcing Language
PRS - Personal Response System
PRTC - Puerto Rico Telephone Company
PS - PicoSecond
PS - PostScript [Adobe (tm)]
PS - PostScriptum
PS - Power Steering
PS - Power Supply
PS - Process Stop Ship
PS - Program Store
PS - Public School
PSA - Problem Statement Analyzer
PSAP - Public Safety Answering Point
PSC - Pittsburgh Supercomputer Center
PSC - Polar Stratospheric Clouds
PSC - Prime Service Contractor
PSC - Public Safety Calling system
PSC - Public Service Commission
PSDC - Public Switched Digital Capability
PSDN - Packet-Switched Data Network
PSDS - Public Switched Digital Service
PSDS - Public Switched Digital Service [telephony, AT&T?]
PSE - Packet Switch Exchange
PSE - Programming Support Environment
PSF - Point Spread Function
PSG - Platoon SerGeant
PSG - Professional Service Group (Sun group)
PSI - Packet Switch Interface
PSIU - Packet Switch Interface Unit
PSK - Phase-Shift Keying
PSL - Problem Statement Language
PSM - Packet Service Module
PSM - Position Switching Module
PSM - Professional Service Manager
PSN - Packet Switch Node
PSN - Packet Switched Network
PSN - Packet Switching Node
PSO - Pending Service Order
PSP - Product Support Plan
PSR - Product Specific Realizations
PSR - Product Specific Release
PSR - PulSaR
PSS - Packet Switch Stream
PSS - Packet Switched Services
PST - Pacific Standard Time
PSTN - Public Switched Telephone Network
PSU - Program Storage Unit
PSW - Program Status Word
PSWM - PostScript Window Manager
PT - Pacific Time
PT - Patrol Torpedo (as in PT boat)
PT - Physical Therapy
PT - Physical Training
PT - Program Timer
PTA - Parent-Teacher Association
PTAT - Private Trans Atlantic Telecommunications
PTD - Parallel Transfer Disk/Drive
PTE - Page Table Entry
PTI - Portable Test Instrument
PTN - Plant Test Number [telephony:actual number assigned for 800 service]
PTO - Patent and Trademark Office
PTO - Please Turn Over
PTO - Power Take-Off
PTP - Point To Point
PTSD - Post Traumatic-Stress Disorder
PTT - Post, Telephone and Telegraph administration
PTT - Postal, Telephone, and Telegraph administration
PTV - Passenger Transport Vehicle [Space]
PTW - Primary Translation Word
PU - Physical Unit
PUC - Peripheral Unit Controller
PUC - Public Utilities Commission
PUD - Planned Unit Development
PUP - PARC Universal Packet protocol
PV - PhotoVoltaic
PVC - Permanent Virtual Circuits
PVC - PolyVinylChloride
PVN - Private Virtual Network
PVO - Pioneer Venus Orbiter
PVT - Private (pilot certificate)
PW - Prisoner of War (usually POW)
PWB - Printed Wiring Board
PWB - Programmers Work Bench
PWD - Print Working Directory
PWG - Permanent Working Group
PX - Post eXchange (see also BX)
Pa - Pascal


Q - Queen('s), "Q." Q - question, "Q." QA - Quality Assurance QAM - Quadrature Amplitude Modulation QAS - Quasi-Associated Signaling QB - queen's bishop (chess) QBP - queen's bishop's pawn (chess) QC - Quality Control QC - Queen's Counsel QD - Quaque Die (daily) QDA - Quantity Discount Agreement QDCS - Quality, Deliverly, Cost, Service / Safety QE - Quick Estimation QED - Quantum ElectroDynamics QED - Quod Erat Demonstrandum (which was to be demonstrated) QEF - Quod Erat Faciendum (which was to be done) QEI - Quod Erat Inveniendum (which was to be found out) QET - Quantum Effect Transistor QIC - Quarter-Inch Cartridge QID - Quater In Die (four times a day) QIS - Quality Information System QKt - queen's knight (chess) QKtP - queen's knights's pawn (chess) QLI - Query Language Interpreter QM - QuarterMaster QMC - QuarterMaster Corps QMF - Query Management Facility QMG - QuarterMaster General QMP - Quality Measurement Plan QMS - Quality Micro Systems QNS - Quantity Not Sufficient QQV - which see (plural of q.v.), "qq.v." QRA - Quality Reliability Assurance QRSS - Quasi Random Signal Source QSO - Quasi-Stellar Object QSS - Quality Surveillance System QTC - Quantitative Technology Corporation QTY - Quantity QUANGO - QUAsi Non-Governmental Organization QUANTAS - QUeensland And Northern Territory Aerial Service, "Quantas" QUANTAS - Quantas Empire Airways QUEL - QUEry Language QV - which see (sing.), "q.v." QWERTY - first six keys from left on top alphabetic row of standard keyboard QWL - Quality of Working Life


R - Republican, "R." R - Ring R - Rolemaster R - rand R - recto, "r." R - right, "r" R - roentgen R - rook in chess RA - Regular Army RA - Research Assistant RA - Return Authorization RA - Royal Academy RA - radium, "Ra" RAAF - Royal Australian Air Force RACE - Random Access Card Equipment RACEP - Random Access and Correlation for Extended Performance RAD - Radiation Absorbed Dose RAD - Rapid Access Disk RADAR - RAdio Detection And Ranging RADAR - Radio Association Defending Airwave Rights (radar detector makers) RADM - Rear ADMiral RAF - Royal Air Force RAID - Redundant Arrays of Inexpensive Disks RAM - Random-Access Memory RAMP - Ratings And Maintenance Phase RAND - Rural Area Network Design RAO - Regional Accounting Office RAO - Revenue Accounting Office RAR - Return Address Register RARDE - Royal Armaments Research and Development Establishment RARE - European Association of Research Networks RARE - Reseaux Associes pour la Recherche Europeenne RARP - Reverse Address Resolution Protocol (Ethernet->Internet) RAS - Reliability, Availability, and Serviceability RASC - Residence Account Service Center RATFOR - RATional FORtran RB - Rhythm and Blues, "R&B" RBC - Red Blood Count RBHC - Regional Bell Holding Company RBI - Runs Batted In RBOC - Regional Bell Operating Company RBOR - Request Basic Output Report RBT - Reliable Broadcast Toolkit RBTL - Read Between The Lines RC - Receive Clock RC - Red Cross RC - Regional Center RC - Repair Center (Sun) RC - Resistance-Capacitance RC - Resistor-Capacitor circuit (as in filters) RC - Roman Catholic RCA - Radio Corporation of America RCAF - Royal Canadian Air Force RCAS - Reserve Component Automation System RCC - Radio Common Carrier RCC - Remote Cluster Controller RCC - Reverse Command Channel RCF - Remote Call Forwarding RCI - Rodent Cage Interface (for SLS mission) RCL - Runtime Control Library RCLDN - Retrieval of Calling Line Directory Number RCM - Remote Carrier Module RCMAC - Recent Change Memory Administration Center RCMP - Royal Canadian Mounted Police RCP - Remote CoPy RCS - Reaction Control System RCS - Revision Control System RCSC - Remote Spooling Communications Subsystem RCU - Radio Channel Unit RCVR - ReCeiVeR RD - Received Data RD - Research and Development, "R&D" RD - Rural Delivery RDA - Remote Data Access RDBMS - Relational DataBase Management System RDES - Remote Data Entry System RDF - Radio Direction Finding RDL - Remote Digital Loopback RDM - Reliably-Delivered Message (sockets) RDP - Reliable Datagram Protocol RDS - Radio Digital System RDT - Radio Digital Terminal REA - Rail Express Agency REC - Regional Engineering Center RECON - Reconnaissance REGIS - REmote Graphics Instruction Set REM - Rapid Eye Movement REM - Rat Enclosure Module (for SLS mission) REM - Rational Economic Man REM - Remote Equipment Module REM - Ring Error Monitor REM - Roentgen Equivalent in Man REMOBS - REMote OBservation System REN - Ring Equivalence Number REO - R. E. Olds REO - Removable, Erasable, Optical REQSPEC - REQuirements SPECification RETMA - Radio Electronics Television Manufacturers Association (rack spacing) REX - Remote EXecution REXX - Restructured EXtended eXecutor RF - Radio Frequency RFC - Request For Comments [Internet] RFD - Rural Free Delivery RFE - Request For Enhancement RFI - Radio Frequency Interference RFP - Request For Proposals RFQ - Request For Quotes RFS - Remote File Sharing RFS - Remote File System RFT - Request For Technology RGB - Red Green Blue RGBI - Red Green Blue Intensity RGP - Raster Graphics Processor RGU - Radio Government/Universal, "RG/U" RH - Right Hand RHC - Regional (Bell) Holding Company RHS - Right Hand Side
RHV - Reid-Hillview Intergalactic, San Jose CA
RI - Receiving & Inspection, "R&I"
RI - Rhode Island
RI - Ring Indicator
RIACS - Research Institute for Advanced Computer Science (at NASA Ames)
RIAS - Radio In the American Sector, berlin
RID - Remote Isolation Device
RIF - Reading Is Fundamental
RIF - Reduction In Force
RIFF - Resource Interchange File Format
RILM - Repertoire International de Literature Musicale
RIP - Raster Image Processor
RIP - Rest In Peace/Requiescat In Pace
RIP - Routing Information Protocol
RIPE - Reseaux IP Europeenne
RIPS - Raster Image Processing Systems Corp.
RISC - Reduced Instruction Set Computer
RISC - Relegate Important Stuff to the Compiler
RISLU - Remote Integrated Services Line Unit
RIT - Rochester Institute of Technology
RITA - Recognition of Information Technology Achievement award
RJE - Remote Job Entry [IBM]
RLC - Resistor Inductor Capacitor
RLCM - Remote Line Concentrating Module
RLDS - The Re-organized Church of Latter-Day Saints
RLG - Research Libraries Group
RLIN - Research Libraries Information Network [run by RLG (q.v.)]
RLL - Run Length Limited
RLOGIN - Remote Login, "rlogin"
RLT - Remote Line Test
RM - Record Marking
RM - Regional Manager
RMA - Return Materials Authorization
RMAS - Remote Memory Administration System
RMATS - Remote Maintenance Admisistration and Traffic System [telephony]
RMF - Read Me First
RMI - Radio Magnetic Indicator
RMR - Remote Message Registers
RMR - Return Material Receipt
RMS - Remote Manipulator System [Space]
RMS - Richard M. Stallman
RMS - Root Mean Square
RMS - Royal Mail Ship
RN - Reference Noise
RN - Registered Nurse
RN - Royal Navy
RNA - RiboNucleic Acid
RNGC - Revised New General Catalog
RNOC - Regional Network Operations Center
RNR - Receive Not Ready
RNZAF - Royal New Zealand Air Force
RO - Read/Only, "R/O"
RO - Receive Only
ROA - Return On Assets
ROB - Remote Order Buffer
ROC - Regional Operating Company
ROE - Rate Of Exchange
ROE - Return On Equity
ROG - Receipt Of Goods
ROH - Receiver Off Hook
ROI - Region Of Interest
ROI - Return On Investment
ROM - Range Of Motion (medical)
ROM - Read-Only Memory
ROM - Rupture Of Membrane (as in birth)
RONA - Return on Net Assets
RONABIT - Return On Asset Before Income Tax
ROSAT - ROentgen SATellite
ROSE - Remote Operations Service Element
ROTC - Reserve Officers' Training Corps
ROTL - Remote Office Test Line
ROTS - Rotary Out Trunks Selectors
ROUS - Rodents Of Unusual Size
ROW - Rest Of the World
ROYGBIV - Red, Orange, Yellow, Green, Blue, Indigo, Violet, "Roy G. Biv"
RP - Rolling Plan
RPC - Remote Procedure Call
RPG - RePort Generator
RPG - Role Playing Game
RPI - Rolling Plan Indices
RPM - Remote Process Management
RPM - Removable Peripheral Module
RPM - Resales Price Maintenance
RPM - Revolutions Per Minute
RPN - Reverse Polish Notation
RPO - Railway Post Office
RPS - Revolutions Per Second
RPS - Rotational Positional Sensing (disks)
RPV - Remotely Piloted Vehicle
RQ - RuneQuest
RQS - Rate/Quote System
RQSM - Regional Quality Service Management
RR - RailRoad
RR - Rate & Route, "R&R"
RR - Receive Ready
RR - Resource Record
RR - Route Relay
RR - Rural Route
RRIP - Rock Ridge Interchange Protocol
RRO - Rate and Route Operator [telephony]
RRO - Reports Receiving Office
RS - Recommended Standard
RS - Recording Secretary
RS - Revised Status
RS - Right Side
RS - Royal Society
RS232 - Digital Communication Standard, "RS-232"
RSA - Repair Service Attendant
RSB - Repair Service Bureau
RSC - Remote Switching Center
RSC - Residence Service Center
RSCS - Remote Source Control System
RSCS - Remote Spooling and Communication Subsystem
RSE - Research & Systems Engineering, "R&SE"
RSFSR - Russian Soviet Federated Socialist Republic
RSH - Remote/Restricted SHell
RSLE - Remote Subscriber Line Equipment
RSLM - Remote Subscriber Line Module
RSM - Remote Switching Module
RSN - Real Soon Now
RSS - Remote Switching System
RSTS - Resource System Time Sharing
RSTSE - Resource System Time Sharing/Enhanced, "RSTS/E"
RSU - Remote Switching Unit
RSV - Revised Standard Edition
RSVP - Repondez S'il Vous Plait (please reply)
RSWC - Right Side up With Care
RT - RadioTelephone
RT - RealTime
RT - Risc Technology [IBM]
RTA - Remote Trunk Arrangement
RTAC - Regional Technical Assistance Center [telephony]
RTC - Right To Copy
RTF - Read This First
RTF - Rich Text Format
RTFM - Read The F***ing Manual
RTG - Radioisotope Thermoelectric Generator
RTL - Resistor-Transistor Logic
RTLS - Return To Launch Site (Shuttle abort plan)
RTM - Regional Telecommunications Management
RTM - Remote Test Module
RTMP - Routing Table Maintenance Protocol
RTR - Reel-To-Reel
RTS - Ready To Send
RTS - Real Time Systems (lll-csrg)
RTS - Reliable Transfer Service
RTS - Remote Testing System
RTS - Return To Stock
RTSE - Reliable Transfer Service Element
RTSL - Read The Source Luke
RTT - Round Trip Time
RTTY - Radio Teletype
RTU - Real Time Unix
RTU - Remote Trunking Unit
RTU - Right To Use
RU - Receive Unit
RUM - Remote User Multiplex
RW - Read/Write
RW - Read/Write, "R/W"
RW - Right Worshipful
RW - Right Worthy
RWC - Remote Work Center
RWE - Remote Wall Enclosure
RWM - Read/Write Memory, "R/WM"
RX - Remote eXchange


S - Siemens S - Sleeve S - South S - Supplement S - second (SI abbrev.), "s" S - sulphur SA - Salvation Army SA - Seaman Apprentice SA - Service Assistant SA - Sex Appeal SA - Sine Anno (without date) SA - South Africa SA - South America SA - South Australia SA - Subject to Approval SAA - South Atlantic Anomaly SAA - Systems Application Architecture (IBM) SAAB - Svenska Aeroplan AktieBolaget (Swedish Aircraft Corporation) SABME - Set Asynchronous Balanced Mode Extended SABRE - Semi-Automated Business Research Environment SAC - Service Area Code SAC - Strategic Air Command [US military] SACK - Selective ACK SADD - Students Against Drunk Driving SAE - Society of Automotive Engineers SAG - Street Address Guide SAGA - Solar Array Gain Augmentation (for HST) SAI - Serving Area Interface SAIC - Science Applications International Corporation SAKDC - Swiss Army Knife Data Compression SALI - Standalone Automatic Location Identification SALT - Strategic Arms Limitting Talks SAM - Surface-to-Air Missile SAMA - Step-by-step Automatic Message Accounting [telephony] SAMPEX - Solar Anomalous and Magnetospheric Particle EXplorer SAMTO - Space And Missile Test Organization SAO - Smithsonian Astrophysical Observatory SAP - Second Audio Program SAP - Service Access Point SAR - Search And Rescue SAR - Store Address Register SAR - Synthetic Aperture Radar SARA - Satellite pour Astronomie Radio Amateur SAREX - Search and Rescue Exercise SAREX - Shuttle Amateur Radio Experiment SARTS - Switched Access Remote Test System SAS - Southern All Stars SAS - Space Activity Suit SAS - Space Adaptation Syndrome SAS - Statistical Analysis Software? SASE - Self-Addressed Stamped Envelope SASE - Specific Application Service Element SASI - Shugart Associates Systems Interface SAT - Satellite [Space] SAT - Scholastic Aptitude Test SAT - Special Access Termination SAT - Supervisory Audio Tone SAT - Synthetic Aperture Telescope SAW - Surface Acoustic Wave SBA - Small Business Administration SBC - Single Board Computer SBMS - Southwestern Bell Mobile Service SBS - Skyline Business Systems SBU - Strategic Business Unit SBUS - School Bus, "S-Bus" SBWR - Simplified Boiling Water Reactor SC - Scanner Controller SC - Secondary Channel SC - Sectional Center SC - Skull & Crossbones, "S&C" SC - South Carolina SC - SpaceCraft, "S/C" SC - SubCommittee SCA - Shuttle Carrier Aircraft SCA - Sunlink Channel Adapter SCAD - Subsonic Cruise Armed Decoy SCADA - Supervisory Control And Data Acquisition SCADC - Standard Central Air Data Computer SCAME - SCreen oriented Anti-Misery Editor SCAMP - Single-Chip A-series Mainframe Processor SCAN - Switched Circuit Automatic Network SCAT - Stromberg-Carlson Assistance Team SCB - System Control Block SCC - Serial Communication Controller SCC - Specialized Common Carrier SCC - Switching Control Center (or Specialized Common Carriers) SCCA - Sports Car Club of America SCCS - Source Code Control System SCCS - Specialized Common Carrier Service SCCS - Switching Control Center System SCE - Signal Conversion Equipment SCE - Structure Chart Editor SCED - SCSI/Ethernet/Diagnostics (Sequent board) SCF - Selective Call Forwarding SCI - SpaceCraft Incorporated SCIFI - SCIence FIction, "sci-fi" SCM - Software Configuration Management SCM - Subscriber Carrier Module SCMS - Serial Copy Management System SCO - Santa Cruz Operation SCO - Serving Central Office SCOOPS - SCheme Object Oriented Programming System SCOT - Stepper Central Office Tester SCOTS - Surveilance and Control Of Transmission Systems SCP - Signal Control Point SCP - Signal Conversion Point SCP - Sunlink Communications Processor SCP - System Control Program SCPC - Signal Channel Per Carrier
SCPD - Supplementary Central Pulse Distributor
SCRAM - Static Column RAM (h/w)
SCS - Silicon Controlled Switch
SCSA - Sun Common SCSI Architecture
SCSI - Small Computer System Interface (pronounced scuzzi)
SCT - Schmidt-Cassegrain Telescope
SCTS - Secondary Clear To Send
SCU - Selector Control Unit
SCUBA - Self Contained Underwater Breathing Apparatus
SCUD - Subsonic Cruise Unarmed Decoy
SCX - Specialized Communications eXchange
SD - SCSI Disk
SD - South Dakota
SDA - Send Data With Immediated Ackonwledge
SDB - Safety Deposit Box
SDCD - Secondary Data Carrier Detect
SDD - Specific Development & Design, "SD&D"
SDF - Secondary Distribution Frame
SDF - SubDistribution Frame
SDH - synchronous digital hierarchy (synchronous multiplexed network)
SDI - Selective Dissemination of Information
SDI - Space Defense Initiative
SDI - Standard Disk Interconnect
SDI - Standard Disk Interface
SDI - Storage Device Interconnect
SDI - Strategic Defense Initiative [US Government]
SDIO - Strategic Defense Initiative Organization
SDIS - Switched Digital Integrated Service
SDL - Specification and Description Language
SDL - System Design Language
SDLC - Synchronous Data Link Control [IBM]
SDM - Sub-rate Data Multiplexer
SDN - Software-Defined Network
SDO - Staff Duty Officer
SDOC - Selective Dynamic Overload Controls
SDP - Service Delivery Point
SDR - Store Data Register
SDRC - Structural Dynamics Research Corporation
SDS - Switched Data Service
SDS - Synchronous Data Set
SDSC - San Diego Supercomputer Center
SDSC - Synchronous Data Set Controller
SDU - Service Data Unit
SDV - Shuttle Derived Vehicle [Space]
SE - South East
SE - Systems Engineer
SEAP - Service Element Access Point
SEAS - Signaling Engineering and Administration System
SEATO - SouthEast Asia Treaty Organization
SEC - Securities and Exchange Commission
SEC - Security Exchange Commission
SECAM - SEquential Couleur Avec Memoire
SECNAV - SECretary of the NAVy
SED - Stream EDitor
SEI - Software Engineering Institute (Carnegie Mellon)
SEI - Space Exploration Initiative
SEL - SELector
SEL - Software Engineering Laboratory
SELV - Safety Extra-Low Voltage
SEM - Scanning Electron Microscope
SER - Satellite Equipment Room
SERC - Science & Engineering Research Council
SERC - Swedish Energy Research Commission
SES - Service Evaluation System
SESRA - Seattle Employee Services Recreation Association
SEST - Swedish-European Submillimeter Telescope
SET - Software Engineering Technology
SETI - Search for ExtraTerrestrial Intelligence
SF - San Francisco
SF - Science Fiction; Speculative Fiction
SF - Single Frequency
SF - Standard Form
SF - Star Frontiers
SFD - Sun Federal Division
SFDM - Statistical Frequency Division Multiplexing
SFMC - Satellite Facility Management Center
SFO - San Francisco CA
SFRPG - Science Fiction Role Playing Game
SG - Signal Ground
SG - StarGuard
SG - SubGroup
SG - SuperGroup
SGI - Silicon Graphics Incorporated
SGML - Standard Generalized Markup Language
SGMP - Simple Gateway Monitoring Protocol (superseded by SNMP)
SHAPE - Supreme Headquarters Allied Powers Europe
SHAR - SHell ARchiver
SHCD - Sherlock Holmes Consulting Detective
SHF - Super High Frequency (3-30GHz)
SHRPG - Super Hero Role Playing Game
SI - Staten Island
SI - Status Indicator
SI - System Integrater
SIAM - Society for Industrial and Applied Mathematics
SIC - Second In Command
SIC - Silicon Integrated Circuit
SICK - Single Income, Coupla' Kids
SID - Sudden Ionospheric Disturbance
SID - System IDentification
SIG - Special Interest Group
SIGCAT - Special Interest Group for Cd-rom Applications Technology
SIMD - Single Instruction, Multiple Data
SIMM - Single Inline Memory Module
SIP - Single Inline Pin
SIPC - Securities Investment Protection Corporation
SIPP - Strategic Industry Partners Program
SIPS - Satellite Imagery Processing System
SIR - Shuttle Imaging Radar
SIRTF - Space (formerly Shuttle) InfraRed Telescope Facility
SIS - Software Information Services
SIS - Strategic Information System
SISAL - Streams and Iteration in a Single-Assignment Language
SISCOM - Satellite Information System COMpany
SIT - Special Information Tone
SITA - Societe Internationale Telecommunications Aeronautiques
SJ - Society of Jesus
SJC - San Jose CA
SKU - Stock Keeping Unit
SL - Salvage Loss
SL - Space Launch [Space]
SL - SpaceLab
SLA - Special Libraries Association
SLA - Symbionese Liberation Army
SLA - Synchronous Line Adapter
SLALOM - Scalable Language-independent Ames Laboratory One-minute Measurement
SLAN - Sine Loco, Anno, (vel) Nomine (without place, year, or name)
SLAPP - Strategic Litigation Against Protesting People
SLAR - Side Looking Airborne Radar
SLBM - Submarine Launched Ballistic Missiles
SLC - Space Launch Complex [Space]
SLC - Subscriber Loop Carrier
SLC - Super Low Cost
SLDC - Synchronous Data Link Control
SLE - Screening Line Editor
SLED - Single Large Expensive Drive
SLIC - Subscriber Line Interface Circuit
SLIC - System Link and Interrupt Controller (Sequent)
SLIM - Subscriber Line Interface Module
SLIP - Serial Line Internet Protocol
SLP - Super Long Play (VHS VCR, aka EP)
SLS - Space(lab) Life Sciences
SLUFAE - Surface Launched Unit, Fuel Air Explosive
SM - Service Mark
SM - Switching Module
SMA - Sergeant Major of the Army
SMA - Spectrum Manufacturers Association
SMAS - Supplementary MAin Store
SMAS - Switched Maintenance Access System
SMASPU - SMAS Power Unit
SMB - System Message Block
SMC - Small Magellanic Cloud (see LMC)
SMD - Storage Module Device (interface standard for disk drives)
SMD - Surface Mounted Devices
SMDF - Subscriber Main Distributing Frame
SMDI - Subscriber Message Desk Interface
SMDR - Station Message Detail Recording
SMDR - Station Message Detailed Recording
SMDS - Switched Multimegabit Data Service
SMDS - switched multimegabit data service, Bellcore-developed standard
SME - Society of Manufacturing Engineers
SME - Solar Mesosphere Explorer
SMEGMA - Sophisticated Modern Editor with Gloriously Magnificent Abilities
SMERSH - abbr. of Russian phrase meaning "Death to the spies."
SMEX - SMall EXplorers
SMG - SuperMasterGroup
SMI - Structure of Management Information
SMI - Sun Microsystems Inc.
SMILS - Sonobuoy Missile Impact Location System
SMIT - System Management Interface Tool
SMM - Solar Maximum Mission
SMO - Santa Monica CA
SMOC - Small Matter Of Commitment
SMOH - Since Major OverHaul
SMOP - Small Matter Of Programming
SMP - Symmetric MultiProcessing
SMPTE - Society of Motion Picture and Television Engineers
SMR - Service Marketing Representative
SMS - Service Management System
SMSA - Standard Metropolitan Statistical Area
SMT - Surface Mount Technology
SMTP - Simple Mail Transfer Protocol
SN - Subnetwork Number
SN - Super Nova
SNA - Santa Ana (Orange County) CA
SNA - Systems Network Architecture [IBM]
SNADS - SNA Distribution Services
SNADS - Systems Network Architecture Distribution Service
SNAFU - Situation Normal -- All Fouled/F***ed Up
SNAP - Shipboard Non-tactical Automated data Processing program
SNAP - SubNetwork Access Protocol
SNAP - System and Network Administration Program
SNCF - Societe National des Chemins de Fer (French National Railways)
SNET - Southern New England Telephone
SNF - Server Normal/Natural Format
SNF - Server-Natural Format
SNM - SunNet Manager
SNMP - Simple Network Management Protocol
SNOBOL - StriNg Oriented symbOLic Language
SNPA - SubNetwork Point of Attachment
SNR - Signal to Noise Ratio
SNR - SuperNova Remnant
SNTSC - Super NTSC (video)
SNU - Solar Neutrino Units
SO - Sales Order
SO - Seller's Option
SO - Significant Other
SO - Space Opera
SO - Strike Out
SOAC - Service Order Analysis Control
SOAP - Symbolic Optimizing Assembler Program
SOAR - Smalltalk On A Risc
SOC - Service Oversight Center
SOF - Sales Order Form
SOFIA - Stratospheric Observatory For Infrared Astronomy
SOH - Service Order History
SOH - Start Of Header, ASCII control character (dec=01,control-A)
SOHIO - Standard Oil of oHIO [Corporate name]
SOHO - SOlar Heliospheric Observatory
SOL - Short on Landing (or, colloquially, Shit Out of Luck)
SOMM - Stop On Micro-Match
SONAR - SOund Detection And Ranging
SONAR - Service Order Negotiation And Retrieval
SONDS - Small Office Network Data System
SONET - Synchronous Optical NETwork
SOP - Standard Operating Procedure
SOR - Sales Order Request
SOS - Save Our Souls (International standard distress call, Morse ...---...)
SOS - Silicon On Sapphire
SOW - Statement Of Work
SP - Shore Patrol
SP - Short Play (VHS VCR)
SP - Signal Processor
SP - Signaling Point
SP - Southern Pacific (railroad) [Corporate name]
SP - Stack Pointer
SP - Standard Play (VHS VCR)
SP - Star Patrol
SP - System Product (IBM VM)
SPA - Software Publishers Association
SPAG - Standards Promotion and Applications Group
SPAN - Space Physics Analysis Network
SPAN - System Performance ANalyzer
SPAR - Stock Points Adp Replacement
SPARC - Scalable Processor ARChitecture
SPARC - Standards, Planning, And Requirements Committee
SPARS - Society of Professional Audio Recording Studios
SPAWAR - naval SPAce and WARfare command
SPC - Software Productivity Consortium
SPC - Southern Pacific Communications
SPC - Statistical Process Control
SPC - Stored Program Control
SPCA - Society for the Prevention of Cruelty to Animals
SPCC - Society for the Prevention of Cruelty to Children
SPCS - Stored Program Control Systems
SPD - Software Products Division
SPDL - Standard Page Description Language (ISO)
SPDM - Special Purpose Dextrous Manipulator
SPE - Symbolic Programming Environment
SPEC - Standard Performance Evaluation Corporation
SPI - Serial Peripheral Interface
SPIM - Sun Product Information Meeting
SPITBOL - SPeedy ImplemenTation of snoBOL
SPL - System Programming Language
SPNI - Society for the Protection of Nature in Israel
SPOT - Systeme Probatoire pour l'Observation de la Terre
SPR - Software Problem Report
SPS - Solar Power Satellite [Space]
SPS - Standby Power System
SPU - System Processing Unit
SPUCDL - Serial Peripheral Unit Controller/Data Link, "SPUC/DL"
SPUD - Storage Pedestal Upgrade Disk/Drive
SPUR - Systech Pluraxial Unplug Repeater
SQA - Software Quality Assurance
SQC - Statistical Quality Control
SQE - Signal Quality Error ("heartbeat")
SQL - Structured Query Language
SQLDS - Structured Query Language/Data System, "SQL/DS"
SQUID - Superconducting QUantum Interference Device
SR - Sales Representative
SR - Street Regal (KDX)
SRA - Selective Routing Arrangement
SRAM - Scratchpad RAM
SRAM - Short Range Attack Missile
SRAM - Static RAM
SRB - Solid (fuel) Rocket Booster [Space]
SRD - Secondary Receive Data
SRI - Stanford Research Institute (now called SRI International)
SRM - Solid Rocket Motor
SRO - Standing Room Only
SRP - source routing protocol, an IBM specification
SRS - Service Repair System
SRTS - Secondary Ready To Send
SS - Sales Support
SS - Sparc Station
SS - Special Services
SS - Stop Ship
SSA - Soaring Society of America
SSA - Social Security Administration [U.S. Government]
SSAP - Session Service Access Memory
SSAS - Station Signaling and Announcement Subsystem
SSB - Single SideBand
SSBAM - Single-SideBand Amplitude Modulation
SSC - Special Services Center
SSC - Specialized Systems Consultants
SSCP - Subsystem Services Control Point
SSCP - System Services Control Point
SSDU - Session Service Data Unit
SSE - Software Support Engineer
SSE - South-SouthEast
SSEL - Session Service Selector
SSF - Space Station Fred (er, Freedom)
SSFF - Showcase Software Factory of the Future
SSG - Staff SerGeant
SSI - Small Scale Integration
SSI - Solid-State Imager (on Galileo)
SSI - Space Services Incorporated [Space]
SSI - Space Studies Institute
SSI - Supplemental Security Income
SSME - Space Shuttle Main Engine
SSO - Satellite Switching Office
SSP - Signal Switching Point
SSP - Sponsor Selective Pricing
SSP - System Status Panel
SSPC - SSP Controller
SSPF - Space Station Processing Facility
SSPRU - SSP Relay Unit
SSPS - Satellite Solar Power Station [Space]
SSR - Secondary Surveillance Radar
SSR - Soviet Socialist Republic
SSRMS - Space Station Remote Manipulator System
SSS - System Support Specialist
SST - Spectroscopic Survey Telescope
SST - Spread-Spectrum Technology
SST - SuperSonic Transport
SSTO - Single Stage to Orbit [Space]
SSTTSS - Space-Space-Time-Time-Space-Space network
SSTV - Slow Scan TeleVision
SSW - South-SouthWest
ST - STart
ST - Seagate Technologies
ST - Short Ton
STAGE - Structured Text And Graphics Editor
STARS - Software Technology for Adaptable, Reliable Systems
STB - Software Technical Bulletin
STC - Serving Test Center
STC - Supplemental Type Certificate
STC - Switching Technical Center
STD - Sacrae Theologiae Doctor (doctor of sacred theology)
STD - Secondary Transmit Data
STD - Sexually Transmitted Disease (replaces VD)
STD - State Transition Diagram
STD - Subscriber Trunk Dialing [British, and elsewhere; equiv. DDD in USA]
STDM - Statistical Time Division Multiplexing
STI - Standard Tape Interface
STILO - Scientific and Technical Intelligence Liaison Office
STIS - Space Telescope Imaging Spectrometer (to replace FOC and GHRS)
STL - St. Louis (Lambert) MO
STN - SuperTwisted Nematic
STOH - Since Top Overhaul (cylinders, etc., but not crankshaft, etc.)
STOL - Short TakeOff and Landing
STP - Signal Transfer Point
STP - Software Through Pictures
STP - Standard Temperature and Pressure (see NTP)
STP - spanning tree protocol, an IEEE 802.1 routing specification
STRPG - Star Trek: The Role-Playing Game
STS - Sales Technical Support
STS - Shared Tenant Service
STS - Shuttle Transport System (or) Space Transportation System
STS - Space-Time-Space network
STSCI - Space Telescope Science Institute, "STScI"
STSI - Space Telescope Science Institute
STTNG - Star Trek: The Next Generation, "ST:TNG"
STTOS - Star Trek: The Old Stuff/The Original Series, "ST:TOS"
STV - Single Transferable Vote
STV - Space Transfer Vehicle [Space]
SU - Set Uid
SUCCESS - SUn Corporate Catalyst Electronic Support Service
SUG - Sun User's Group
SUM - Symantec Utilities for Macintosh
SUN - Stanford University Network
SUNDIAG - SUN system DIAGnostics software
SUNET - Swedish University NETwork
SUNOCO - SUN Oil COmpany [Corporate name]
SUNVIEW - SUN's Visual / Integrated Environment for Workstations
SUNY - State University of New York
SURANET - Southeastern Universities Research Association network, "SURAnet"
SURF - Sequent Users Resource Forum
SUSP - System Use Sharing Protocol
SVC - Switched Virtual Circuits
SVID - System V Interface Definition
SVP - Schematic Verification Program
SVR4 - System V Release 4
SVS - Switched Voice Service
SVVS - System V Validation Suite
SVVS - System V Verification Suite
SW - South West
SW - SuperWorld
SWAN - Sun Wide Area Network
SWAS - Submillimeter Wave Astronomy Satellite
SWB - SouthWestern Bell
SWF - ShortWave Fading
SWIFT - Society for Worldwide Interbank Financial Transfers
SWM - Solbourne Window Manager
SWO - Sales Work Order
SWS - Scientific Workstation Support (at ORNL)
SX - SimpleX signaling
SXS - Step by (X) Step switching [Telephony]
SYC - SYstem Control
SYMPL - SYsteMs Programming Language
SYN - SYNchronizing segment
SYSGEN - SYStem GENeration


T - Tip T - Traveler T - tera- (SI prefix) T - tesla T - ton(s), "t." T - tonne(s), "t." T - tritium T - tun(s), "t." T1 - 1.544Mbps [telephony], one of the basic signalling systems 24x64Kb T1FE - T1 carrier Front End T1OS - T1 carrier OutState, "T1/OS" T3 - 44.736 Mbps (eq 28 T1 channels) [Telephony] TA - Teaching Assistant TA - Terminal Adaptor TA - Territorial Army TA - Transfer Allowed TAB - Tape Assembly Bonding TAB - Technical Assistance Board TAC - Tactical Air Command (see SAC) TAC - Terminal Access Circuit TAC - Terminal Access Controller [ARPAnet/MILNET/DDN] TACCS - Tactical Army Combat service support Computer System TAE - Transportable Applications Environment TAG - Technical Advisory Group (ISO) TAL - Transatlantic Abort Landing (Shuttle abort plan) TAM - Total Available Market TANSTAAFL - There Ain't No Such Thing As A Free Lunch TAP - Telephone Assistance Plan TAR - Tape ARchiver TAS - Telephone Answering Service TASC - Technical Assistance Service Center TASC - Telecommunications Alarm Surveillance and Control system TASI - Time Assignment Speech Interpolation system TAT - TransAtlantic Telephone TAT - Turn Arround Time TAU - Thousand Astronomical Units [Space] TB - TuBerculosis TBA - To Be Announced/Arranged TBD - To Be Designed/Determined TBO - Time Between Overhaul TC - Teachers College TC - Technical Committee (ISO) TC - Timing Counter TC - Tinned Copper TC - Toll Center TC - Total Color TCA - Terminal Control Area TCA - Terminal Controlled Airspace TCAP - Transaction Capabilities Applications Port TCAS - T-Carrier Administration System TCB - Task Control Block TCB - Trusted Computer Base TCC - Trunk Class Code TCCC - Technical Committee on Computer Communications TCG - Test Call Generation TCM - Time Compression Multiplexer TCM - Trellis Coded Modulation TCP - Transmission Control Protocol TCPIP - Transmission Control Protocol/Internet Protocol, "TCP/IP" TCR - Transient Call Record TCS - Thermal Control System TCS - Traction Control System (to prevent wheel-spin) TCSEC - Trusted Computer System Evaluation Criteria (orange book) TCT - To Challenge Tomorrow TCT - Toll Connecting Trunk TD - TouchDown TD - Transmit Data TD - Treasury Department TDAS - Traffic Data Administration System TDC - Tape Data Controller TDC - Terrestrial Data Circuit TDCC - Transportation Data Coordinating Committee TDD - Telecommunications Device for Deaf TDD - Telephone Device for the Deaf TDE - Transition Diagram Editor TDI - Trusted Database Interpretation TDL - Test Description Language TDM - Time-Division Multiplexing TDMA - Time-Division Multiple Access TDO - Table of Denial Orders TDR - Time Domain Reflectometer TDRS - Tracking and Data Relay Satellite [Space] TDRSS - Tracking and Data Relay Satellite System TDY - Temporary DutY TE - Terminal Equipment TE - Transverse Electric TEB - Teterboro NJ TEC - Technology Exchange Company TECO - Tape Editor and COrrector TEFLON - polyTEtraFLuOrethyleNe TEHO - Tail End Hop Off TELEX - TELetypewriter EXchange TELSAM - TELephone Service Attitude Measurement TEMA - Tubilar Exchanger Manufacturers Association TEMPEST - Transient Electro-Magnetic Pulse Emanation STandard TEMPO - Technical Military Programming Organization TER - Technical Education Resources TERM - TERMinal TES - Thermal Emission Spectrometer (on Mars Observer) TFC - Total Full Color TFLAP - T-carrier Fault-Locating Applications Program TFP - Tops Filing Protocol TFS - Translucent File System TFS - Trunk Forecasting System TFT - The Fantasy Trip TFT - Thin Film Transistor TFTP - Trivial File Transfer Protocol TG - Thieves' Guild TGC - Terminal Group Controller TGN - Trunk Group Number TGV - Two Guys and a Vax
TH - Trouble History
THIEF - THief/This Here Isn't Even Fine
THOR - THermal Optical Recording
THOR - Tandy High-intensity Optical Recording
THRUSH - Technological Hierarchy for the Removal of Undesireables and Subjugation of Humanity
THX - Tom Holman Xover
TI - Texas Instruments
TI - Transport Independent
TIA - Telephone Information Access
TIA - Thanks In Advance [net jargon]
TIA - Transient Ischemic Attack
TIC - TermInfo Compiler
TID - Ter In Die (three times a day)
TIFF - Tag Image File Format
TIFF - Tagged Image File Format
TINA - TINA Is Not an Acronym
TINA - This Is Not an Acronym
TIP - Team Improvement Program
TIRKS - Trunk Integrated Record Keeping System
TIROS - Television InfraRed Observation Satellite
TKO - Technical Knock Out
TL - Total Loss
TLA - Three Letter Acronym
TLB - Translation lookaside buffer
TLC - Tender Loving Care
TLI - Transport Level Interface (AT&T stream-based protocol)
TLM - Trouble Locating Manual
TLN - Trunk Line Network
TLP - Transmission Level Point
TLTP - Trunk Line and Test Panel
TLV - Type, Length, Value
TM - TradeMark
TM - Transverse Magnetic
TMA - Tycho Magnetic Anomaly [movie 2001]
TMAC - Treasury department's Multiuser Acquisition Contract
TMDF - Trunk Main Distributing Frame
TMIS - Telecommunications Management Information System
TMMS - Telephone Message Management System
TMO - Telephone Money Order
TMP - The Morrow Project
TMR - Transient Memory Record
TMRC - Tech Model Railroad Club [MIT]
TMRC - Transportation Modeling Research Center (TMRC {above} alter ego)
TMRS - Traffic Measurement and Recording System
TMRS - Traffic Metering Remote System
TMS - Time-Multiplexed Switch
TMSC - Tape Mass Storage Control (DEC)
TN - Telephone Number
TN - Tennessee
TN - Transaction Number
TN - Twisted Nematic
TNC - Threaded Navy Connector
TNC - Threaded Neill Concelman (connector) [electronics] (see also BNC)
TNDS - Total Network Data System
TNN - Trunk Network Number
TNOP - Total Network Operation Plan
TNPC - Traffic Network Planning Center
TNT - The NeWS Toolkit
TNT - TriNitroToluene
TO - Telegraph Office
TO - Turn Over
TOC - Table Of Contents
TOD - Time-Of-Day
TODS - Transactions on Database Systems (ACM)
TOMS - Total Ozone Mapping Spectrometer
TOMS - Transactions on Mathematical Software (ACM)
TOOIS - Transactions on Office Information Systems (ACM)
TOP - Technical/Office Protocol
TOPICS - Total On-Line Program and Information Control System (NHK)
TOPLAS - Transactions on Programming Languages and Systems (ACM)
TOPS - Timesharing OPerating System
TOPS - Traffic Operator Position System
TOPS - Transcendental OPerating System
TORES - Text ORiented Editing System
TOS - Transfer Orbit Stage [Space]
TOW - Tube launched, Optically tracked, Wire guided missile
TOY - Time Of Year (clock)
TP - Test Plan
TP - Third Party
TP - Toll Point
TP - Transaction Processing
TP - Transport Protocol
TP - Twisted Pair
TP - from TP0 and TP4 (ISO/CCITT Transport Services; like TCP)
TP0 - OSI Transport Protocol Class 0 (Simple Class)
TP4 - OSI Transport Protocol Class 4 (Error Detection and Recovery Class)
TPC - The Phone Company [movie The President's Analyst)
TPE - Twisted Pair Ethernet
TPI - Tracks Per Inch
TPM - Third-Party Maintenance
TPMP - Total network data system Performance Measurement Plan
TPO - Traveling Post Office
TPS - Technical Publication Software
TPS - Technical Publishing Software
TPS - TeleProcessing Services
TPS - Thermal Protection System
TPT - Twisted Pair Transceiver
TQC - Total Quality Control
TR - Test Register
TR - Token Ring
TR - Transfer Register
TRAC - Total Risk Analysis Calculation (SunTrac)
TREAT - Trouble Report Evaluation Analysis Tool
TRIB - Transfer Rate of Information Bits
TROFF - Text RunOFF, text formatter
TROFF - Typsetter new ROFF
TRON - The Real-time Operating Nucleus
TRON - The Realtime Operating system Nucleus
TRR - Tip-Ring Reverse
TRR - Token Ring Repeater
TRSA - Terminal Radar Service Area
TRW - Thompson, Ramo, and Woolridge
TS - Top Secret
TSAP - Transport Service Access Point
TSCPF - Time Switch and Call Processor Frame
TSD - Total System Design
TSDU - Transport Service Data Unit
TSE - Technical Support Engineer (Sun)
TSEL - Transport Service Selector
TSI - Time Slot Interchanger
TSM - Tech Support Manager
TSO - Technical Standard Order
TSO - Time Sharing Option
TSORT - Transmission System Optimum Relief Tool
TSP - Teleprocessing Services Program
TSP - Test SuPervisor
TSP - Thrift Savings Plan
TSP - Time Synchronization Protocol
TSP - Traffic Service Position
TSP - TriSodium Phosphate
TSPS - Traffic Service Position System
TSR - TSR (Fortune 500 Company that manufactures Dungeons & Dragons)
TSR - Terminate and Stay Resident
TSR - Test Summary Report
TSS - Tethered Satellite System [Space]
TSS - Time-Sharing System
TSS - Trunk Servicing System
TSST - Time-Space-Space-Time network
TST - Time-Space-Time network
TST - Traveling-Wave Tube
TSTO - Two Stage to Orbit [Space]
TSTS - Time-Space-Time-Space network
TT - Trunk Type
TT - Tunnels & Trolls, "T&T"
TTC - Telecommunications Technology Council
TTC - Terminating Toll Center
TTD - Things To Do
TTFN - Tah Tah, For Now
TTL - Time To Live
TTL - Transistor-Transistor Logic
TTMA - Tennessee Tech Microcomputer Association
TTP - Telephone Twisted Pair
TTP - Trunk Test Panel
TTS - Trunk Time Switch
TTTN - Tandem Tie Trunk Network
TTU - Tennessee Technological University
TTY - TeleTYpe(writer)
TTYC - TTY Controller
TUNIS - Toronto UNIversity System
TUR - Traffic Usage Recording
TUR - Trunk Utilization Report
TV - TeleVision
TVA - Tennessee Valley Authority
TVTWM - Tom's Virtual TWM
TW - Thieves' World
TWA - Trans World Airlines
TWG - The Wollongong Group
TWIMC - To Whom It May Concern
TWM - Tab (or Tom's) Window Manager
TWT - Traveling Wave Tube
TWX - TeletypeWriter eXchange
TX - Texas
TX - Transmit
TX - Transuction
TXID - Transuction Identifier


U - (representing the greek mu) - micro, "u" U - Universe U - unified atomic mass unit, "u" U - uranium UA - United Artists UA - User Agent UAB - UNIX Appletalk Bridge UAE - United Arab Emerates UAPDU - User Agent Protocol Data Unit UAR - United Arab Republic UAR - User Action Routine UARS - Upper Atmosphere Research Satellite UART - Universal Asynchronous Receiver and Transmitter UBA - UniBus Adapter [DEC] UBC - Universal Bibliographic Control UBC - University of British Columbia UBM - Unpressurized Berthing Mechanism UC - University of CA UC - upper case, "u.c." UCAR - University Corporation for Atmospheric Research UCB - University of California at Berkeley UCC - Uniform Commercial Code UCD - Uniform Call Distribution UCD - University of California at Davis UCI - University of California at Irvine UCL - Underwater Sound Laboratory UCL - University College London UCLA - University of California at Los Angeles UCR - University of California at Riverside UCSB - University of California at Santa Barbara UCSC - University of California at Santa Cruz UCSD - University of California at San Diego UCSF - University of California at San Francisco UDB - Unified DataBase UDMH - Unsymmetrical DiMethyl Hydrazine UDP - User Datagram Protocol UDT - User Defined Type UEC - User Environment Component UFO - Unidentified Flying Object UFS - Universal File System UG - Micro-Grip (HP plotter paper positioner) UGC - Uppsala General Catalog UH - Upper Half UHF - Ultra High Frequency (300-3000MHz) UI - Unix International UI - User Interface UIC - User Identification Code UID - User IDentity UIL - User Interface Language UIMS - User Interface Management System UIP - User Interface Program UIT - Ultraviolet Imaging Telescope (Astro package) UITP - Universal Information Transport Plan UIUC - University of Illinois at Urbana-Champaign UK - United Kingdom UKST - United Kingdom Schmidt Telescope UL - Underwriters Laboratory ULANA - Unified LAN Architecture ULANA - Unified Local-Area Network Architecture UMT - Universal Military Training UN - United Nations UNCLE - United Network Command for Law Enforcement UNESCO - United Nations Educational, Scientific, & Cultural Organization UNICEF - United Nations International Children's Emergency Fund (now UN Child. Fund) UNICS - UNiplex Information Computer Services UNISTAR - UNIversal Single call Telecommunications Answering & Repair UNIVAC - UNIversal Automatic Computer UNIX - not an acronym at all. Was a pun on MIT's MULTICS. UNMA - Unified Network Management Architecture UNO - United Nations Organization UP - Union Pacific (railroad) [Corporate name] UP - Upper Peninsula (of Michigan) UPC - Universal Product Code UPDS - Uninterruptible Power Distribution System UPI - United Press International [Corporate name] UPS - Uninterruptible Power Supply UPS - United Parcel Service [Corporate name] UR - University of Rochester UREP - UNIX-RSCS Emulation Program (BITNET software for UNIX) US - United States (of America) USA - Union of South Africa USA - United States Army USA - United States of America USAC - US Answer Center (Sun Hotline) USAC - United States Answer Center USAC - United States Auto Club USAF - United States Air Force USAFA - United States Air Force Academy (in Colorado Springs) USAN - University Satellite Network USB - Upper Side Band USC - University of Southern California USCA - United States Code, Annotated USCG - United States Coast Guard USD - Underwriters Safety Device USDA - United States Department of Agriculture USES - United States Employment Service USFL - United States Football League USG - Unix Support Group USGS - United States Geological Survey USHGA - United States Hang Gliding Association USIA - United States Information Agency USITA - United States Independent Telephone Association USL - Unix System Laboratories USM - United States Mail USMC - United States Marine Corps USMP - United States Microgravity Payload USN - United States Navy USO - United Service Organizations USO - Universal Service Order USO - Unix Software Operation USOC - Universal Service Order Code USP - United States Pharmacopeia USP - Universal Sampling Plan USPS - United States Postal Service USPTO - United States Patent and Trademark Office USR - User Service Routines USS - United States Ship USSR - Union of Soviet Socialist Republics USSS - User Services and Systems Support USW - Und So Weiter UT - UTah UT - Universal Time UT - University of Tennessee UT - University of Texas UTC - Universal Coordinated Time UTE - Union Technique de i"Electricite" UTP - Unshielded Twisted Pair UTQGS - Uniform Tire Quality Grading System UTR - UpTime Ratio UUCICO - Unix to Unix Copy Incoming Copy Outgoing UUCP - Unix-to-Unix CoPy UUG - Unix User Group UUT - Unit Under Test UV - UltraViolet UVS - UltraViolet Spectrometer UW - UnderWriter UW - University of Wisconsin UWCSA - University of Washington Computer Science Affiliates UWS - Ultrix Workstation Software


V - Vergeltungswaffe (reprisal weapon: V1, V2) V - fiVe V - vanadium V - version, "v" V - versus, "v." V - volt(s) VA - Veterans Administration VA - Virginia VAB - Value Added Business VAB - Vehicle Assembly Building (formerly Vertical Assembly Building) VABIS - Vagn Aktie Bolaget i Soedertaelje (Swedish truck company) VAC - Volts of Alternating Current VAD - Value Added Dealer VADS - Verdix Ada Development System VAFB - Vandenberg Air Force Base VAN - Value-Added Network (e.g. Tymnet, Telenet, etc) VANS - Value-Added Network Services VAP - Value-Added Process VAR - Value-Added Remarketer/Reseller VASCAR - Visual Average Speed Computer And Recorder VASI - Visual Approach Slope Indicator VAST - Virtual Archive Storage Technology VAT - Value Added Tax VAV - Value Application Venders VAX - Virtual Address eXtended VAXBI - VAX Bus Interconnect VB - Venture Business VC - Virtual Circuit VCCI - Volantary Control Council for Intersive VCM - Voice Coil Motor VCO - Voltage Controlled Oscillator VCR - VideoCassette Recorder VCS - Virtual Circuit System VCU - Virginia Commonwealth University VD - Venereal Disease (see also STD) VDC - Volts of Direct Current VDE - Verband Deutscher Electrotechniker VDFM - Virtual Disk File Manager VDI - Virtual Device Interface VDM - Vienna Development Method VDM - Virtual Device Metafile VDT - Video Display Terminal VE - Value Engineering VEEGA - Venus-Earth-Earth Gravity Assist (Galileo flight path) VEU - Volume End User VEX - Video Extension to X VF - Video Frequency VF - Voice Frequency VFEA - VMEbus Futurebus+ Extended Architecture VFO - Variable Frequency Oscillator VFR - Visual Flight Rules VFS - Virtual File System VFW - Veterans of Foreign Wars VFW - Volunteer Fire Department VFY - VeriFY VG - Very Good VG - Vicar-General VGA - Video Graphics Array/Accelerator VGF - Voice Grade Facility VGI - Virtual Graphics Interface VHD - Video High Density VHDL - Vhsic Hardware Description Language VHF - Very High Frequency (30-300MHz) VHS - Video Home System (VCR) VHSIC - Very High Speed Integrated Circuit VI - VIsual editor VIABLE - Vertical Installation Automation BaseLinE VIC - V.35 Interface Cable VIFRED - VIsual FoRms EDitor VILE - VI-Like Emacs VINE - Vine Is Not Emacs VINES - VIrtual NEtwork Software VIP - Very Important Person VISTA - Volunteers In Service To America VITA - Vme International Trade Association VIU - Voiceband Interface Unit VJ - Video Jockey VL - Vulgar Latin VLA - Very Large Array radio telescope in Arizona or New Mexico VLBA - Very Long Baseline Array VLBI - Very Long Baseline Interferometry VLF - Very Low Frequency (3-30KHz) VLIW - Very Long Instruction Word VLSI - Very Large Scale Integration VLT - Very Large Telescope VM - Virtual Machine VM - Virtual Memory VMC - Visual Meteorological Conditions VMCF - Virtual Machine Communications Facility VMCMS - Virtual Machine/Conversational Monitor System, "VM/CMS" VME - Versa Modular Europa VME - Versabus Module Europe VME - Virtual Machine Environment VMM - Virtual Memory Manager VMOS - Vertical Metal Oxide Semiconductor (V-MOS) (see MOS) VMR - Vertical Market Reseller VMR - Volt-Meter Reverse VMRS - Voice Message Relay System VMS - Vertical Motion Simulator VMS - Virtual Memory System VMS - Virtual Memory operating System VMS - Voice Mail System VMS - Voice Management System VMSP - Virtual Machine/System Product, "VM/SP" VMTP - Versatile Message Transaction Protocol VNF - Virtual Network Feature VNL - Via Net Loss plan VNLF - Via Net Loss Factor VNY - Van Nuys CA VOA - Voice Of America VOA - Volunteers Of American VODAS - Voice Over Data Access Station VOIR - Venus Orbiting Imaging Radar (superseded by VRM) VOIS - Voice-Operated Information System VOQ - Visiting Officer's Quarters VOR - VHF Omnidirectional Range VORT - Very Ordinary Rendering Toolkit VP - View Processor VP - Virtual President VPF - Vertical Processing Facility VPISU - Virginia Polytechnic Institute and State University, "VPI&SU" VPN - Virtual Private Network VR - Variety Reduction VRC - Vertical Redundancy Character VRM - Venus Radar Mapper (now called Magellan) VRM - Virtual Resource Manager VRM - Voice Recognition Module VRS - Voice Response System VS - VAXStation VSAM - Virtual Sequential Access Method VSAM - Virtual Storage Access Method VSAT - Very Small Aperture Terminal, satellite dish VSB - Vestigial SideBand modulation VSE - Virtual Storage Extended VSP - Vector/Scalar Processor VSR - Voice Storage and Retrieval VSS - Voice Storage System VSSP - Voice Switch Signaling Point VSX - X/open Verification Suite VT - Virtual Terminal VTAM - Virtual Telecommunications Access Method [IBM] VTI - Virtual Terminal Interface VTOC - Volume Table Of Contents VTOL - Vertical TakeOff and Landing VTP - Virtual Terminal Protocol VTR - VideoTape Recorder VTS - Video Teleconferencing System VU - Volume Unit VUIT - Visual User Interface Tool VUP - Vax Unit of Performance VV - Villains & Vigilantes, "V&V" VVSS - Vertical Volute Spring Suspension VWS - VAX Workstation Software VXI - VMEbus Extension for Instrumentation


W - Wales/Welsh W - Wednesday, "W." W - West W - Width W - watt W - week(s), "w." W - wofram (tungsten) WA - Washington WA - Western Australia WAC - Womens Air Corps WADS - Wide Area Data Service WAG - Wild-Assed Guess WAIS - Wide Area Information Server WAN - Wide Area Network WAP - Work Assignment Procedure WARC - World Administrative Conference WATFOR - WATerloo FORtran WATS - Wide Area Telephone Service WATSUP - WATfor Student Utility Program WB - Water Ballast WB - WayBill WBC - White Blood Cells WBS - Wednesday Business School WBS - Work Breakdown Structure WC - Water Closet WC - Wire Center WC - Without Charge WCL - Widget Creation Library WCPC - Wire Center Planning Center WCS - Writable Control Store (VAX) WCTU - Women's Christian Temperance Union WD - White Dwarf WD - Working Draft WDC - Washington, District of Columbia WDC - Work Distribution Chart WDM - wavelength-division multiplexing, for optical fibre, ultra-gigabit WDT - Watch Dog Timer WELL - Whole Earth 'Lectronic Link WF - Work Factor method WFPC - Wide Field / Planetary Camera (on HST) WFPCII - Replacement for WFPC WG - Working Group WGS - WorkGroup System (AT&T's 386 PC) WH - WarHammer WHBL - World Home Bible League WHO - World Health Organization WHOI - Woods Hole Oceanographic Institution WHSE - Warehouse WHSGNASBN - We Have Some Good News And Some Bad News WI - Wisconsin WINS - Wollongong Integrated Networking Solutions WIP - Work-In-Process WIS - WWMCCS Information System WITS - Washington Interagency Telecommunications System WIYN - Wisconsin / Indiana / Yale / NOAO telescope WKS - Well Known Services WM - Work Manager WMO - World Meteorological Organization WMSCR - Weather Message Switching Center Replacement WNN - Watashi no Namae ha Nakajima desu. (Kana-Kanji henkan), "Wnn" WO - Write Only WOMBAT - Waste Of Money, Brains, And Time WOPR - War Operations Planned Response (from "Wargames" movie) WORM - Write Once, Read Many time WOW - Worlds of Wonder WP - Word Processing WP - Working Paper WPS - Word Processing Software WRT - With Respect To WS - Work Sampling WS - Work Station WSD - Work Station Division WSI - Wafer Scale Integration WSJ - Wall Street Journal WSMR - White Sands Missile Range WSN - Wirth Syntax Notation WSP - Work Simplification Program WSW - West-SouthWest WTF - What The Fuck WTR - Western Test Range WU - Washington University WU - Western Union WUPPE - Wisconsin Ultraviolet PhotoPolarimter Experiment (Astro package) WV - West Virginia WW - World War WW2 - World War II WWFO - World Wide Field Operations WWI - World War I WWII - World War II WWMCCS - World-Wide Military Command and Control System WWOPS - World-Wide Operations WY - Wyoming WYSIWIS - What You See Is What I See WYSIWYG - What You See Is What You Get


X25 - CCITT recommendation for packet switched networks DTE interfacing, "X.25" XA - eXtended Architecture (31-bit addressing in IBM machines) XB - X-Bar XBT - X-Bar Tandem XCF - eXperimental Computing Facility XD - eX (without) Dividend XD - without Dividend XDMCP - X Display Manager Control Protocol XDR - eXternal Data Representation XEC - eXperimental Estelle Compiler XFE - X-Front End XFER - transFER (the X is for trans) XID - eXchange IDentification XIE - X Imaging Extension XIM - X Input Method XINU - Xinu Is Not UNIX XL - eXtra Large XMI - eXtended Memory Interconnect (DEC) XMM - X-ray Multi Mirror XMS - eXtended Multiprocessor operating System XMTR - transMiTteR (the X is for trans) XNS - Xerox Network Services/Systems/Standard XO - eXecutive Officer XOR - eXclusive OR (logical function) XP - Jesus Christ (from the first two letters of "Christ" written in Greek) XPG - X/Open Portability Guide XPG2 - X/Open Portability Guide Release-2 XPORT - transPORT (the X is for trans) XRM - X Resource Manager XSECT - cross SECTion (the X is for cross) XT - X.11 Toolkit, "Xt" XTAL - crysTAL (another version of x for crys, see XMTR) XTAL - crysTAL (the X is for crys) XTC - eXternal Transmit Clock XUI - X-windows User Interface XUV - eXtreme UltraViolet XVIEW - X window system-based Visual/Integrated Environment for Workstations XWSDS - X Window System Display Station


Y - year, "y." Y - yen Y - yttrium YA - Yet Another YACC - Yet Another Compiler Compiler YAFIYGI - You Asked For It, You Got It YB - YearBook YMCA - Young Mens Christian Association YMHA - Young Mens Hebrew Association YOB - Year Of Birth YP - Yellow Pages YPVS - Yamaha Power Valve System YRS - Ysgarth Rules System YSO - Young Stellar Object YST - Yukon Standard Time YT - Yukon Territory YT - Yukon Time YTD - Year To Date YWCA - Young Womens Christian Association YWHA - Young Womens Hebrew Association YY - Year


Z - Zenith Z - Zero ZB - Zero Beat ZBB - Zero Base Budgeting ZBR - Zone Bit Recording ZD - Zero Defect ZETA - Zero Energy Thermonuclear Assembly ZG - Zero Gravity ZGS - Zero Gradient Synchrotron ZI - Zonal Index ZIF - Zero Insertion Force ZIP - Zig-zag Inline Pin ZIP - Zone Improvement Plan (post office code) ZIP - Zone Information Protocol ZK - barrage balloon (navy symbol) ZMRI - Zinc Metals Research Institute ZPG - Zero Population Growth ZPRSN - Zurich Provisional Relative Sunspot Number ZST - Zone Standard Time ZT - Zone Time

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