SOH Start Of Header, ASCII control character (dec=01,control-A)
SOHIO Standard Oil of oHIO [Corporate name]
SOHO SOlar Heliospheric Observatory [Space]
SOL Short on Landing (or, colloquially, Shit Out of Luck)
SONAR SOund Detection And Ranging
SONET Synchronous Optical Network [Telephony]
SOP Standard Operating Procedure
SOS Save Our Souls (International standard distress call, Morse ...---...)
SOS Silicon On Sapphire
SOS Son of Stopgap (editor) [DEC]
SP Shore Patrol
SP Short Play (VHS VCR)
s.p. sine prole (Latin: without issue) [Genealogy]
SP Southern Pacific [Corporate name, Railroading]
SP Stack Pointer
SP Star Patrol
SPA Software Publishers Association
SPAG Standards Promotion and Applications Group
SPAN Space Physics and Analysis Network [NASA] (DECnet)
SPAN Space Physics and Analysis Network [Space]
SPAR Stock Points Adp Replacement
SPARC Scalable Processor ARChitecture
SPARC Standards, Planning, And Requirements Committee
SPAWAR naval SPAce and WARfare command
SPC Software Productivity Consortium
SPCA Society for the Prevention of Cruelty to Animals
SPCC Society for the Prevention of Cruelty to Children
SPDM Special Purpose Dextrous Manipulator [Space]
SPEC Systems Performance Evaluation Cooperative
SPITBOL SPeedy ImplemenTation of snoBOL
SPNI Society for the Protection of Nature in Israel
SPOT Systeme Probatoire pour l'Observation de la Terre [Space]
SPS Solar Power Satellite [Space]
SPUR Systech Pluraxial Unplug Repeater
SQE Signal Quality Error (IEEE 802.3, eqv to D/I/X "Collision Presence Test") [Ethernet]
SQIID Simultaneous Quad Infrared Imaging Device (at NOAO)
SQL Structured Query Language
SQUID Superconducting QUantum Interference Device
SRAM Short Range Attack Missile
SRAM Static RAM
SRB Solid (fuel) Rocket Booster [Space]
SRG Short and Ring Ground (test) [Telephony]
SRI Stanford Research Institute
SRM Solid Rocket Motor [Space]
SRO Standing Room Only
SS7 Signalling System #7 [Telephony]
SSA Social Security Administration [US Government]
SSB Single Side Band
SSC Superconducting Super Collider
SSE South-SouthEast
SSF Space Station Fred (er, Freedom) [Space]
SSF Space Station Freedom [NASA, Space]
SSFF Showcase Software Factory of the Future
SSG Staff SerGeant
SSI Small Scale Integration
SSI Solid-State Imager (on Galileo) [Space]
SSI Space Services Incorporated [Corporate name, Space]
SSI Space Studies Institute [Space]
SSI Supplemental Security Income
SSME Space Shuttle Main Engine [Space]
SSPF Space Station Processing Facility [Space]
SSPS Satellite Solar Power Station [Space]
SSR Secondary Surveillance Radar
SSR Soviet Socialist Republic
SSRMS Space Station Remote Manipulator System [Space]
SST Spectroscopic Survey Telescope [Space]
SST SuperSonic Transport [Space]
SSTO Single Stage To Orbit [Space]
SSTV Slow Scan TeleVision
SSW South-SouthWest
ST Short Ton
STARS Software Technology for Adaptable, Reliable Systems
STD Sacrae Theologiae Doctor (doctor of sacred theology)
STD Sexually Transmitted Disease (replaces VD)
STD State Transition Diagram
STD Subscriber Trunk Dialing (British, and elsewhere; equiv. DDD in USA)
STI Standard Tape Interconnect [DEC]
STILO Scientific and Technical Intelligence Liaison Office
STIS Space Telescope Imaging Spectrometer (to replace FOC and GHRS) [Space]
STL St. Louis (airport designation)
STN SuperTwisted Nematic
STOL Short TakeOff and Landing
STP Shielded Twisted Pair [Telecom, Networking]
STP Software Through Pictures
STP Standard Temperature and Pressure (see NTP)
STRPG Star Trek: The Role-Playing Game
STS Space Transportation System (space shuttle) [NASA]
STScI Space Telescope Science Institute [Space]
STV Single Transferable Vote
STV Space Transfer Vehicle [Space]
SUM Symantec Utilities for Macintosh
SUN Stanford University Network
SUN SUN MicroSystems Computer (not an Acronym) [Corporate name]
SUNOCO SUN Oil COmpany [Corporate name]
SUNY State University of New York
SURAnet Southeastern Universities Research Association Network
SVID System V Interface Definition
SW South West
SW SuperWorld
SWAS Submillimeter Wave Astronomy Satellite [Space]
SWBT South Western Bell Telephone [Telephony]
SWF ShortWave Fading [Space]
SWIFT Society for Worldwide Interbank Financial Communications
SWS Scientific Workstation Support
SXS Step by Step switching [Telephony]
T Traveler
T1 1.544Mbps [Telephony], one of the basic signalling systems 24x64Kb
T3 45Mbps (eq 28 T1 channels) [Telephony]
TA Teaching Assistant
TAC Tactical Air Command (see SAC)
TAC Terminal Access Controller [ARPANET/MILNET] (replaced TIP)
TACACS Terminal Access Controller Access Control System [ARPANET/MILNET]
TACCS Tactical Army Combat service support Computer System
TAE Transportable Applications Environment
TAL Trans-Atlantic Abort Landing [NASA, Shuttle]
TAL Transatlantic Abort Landing (Shuttle abort plan) [Space]
TANSTAAFL There Ain't No Such Thing As A Free Lunch
TAR Tape ARchiver
TASI Time Assign{ment,ed} Speech Interpolation [Telephony]
TAU Thousand Astronomical Units [Space]
TB TuBerculosis
TBA To Be Announced
TBD To Be Determined
TBD To Be Done
TC Teachers College
TCA Terminal Controlled Airspace
TCP Transmission Control Protocol
TCP/IP Transmission Control Protocol/Internet Protocol
TCS Thermal Control System [Space]
TCSEC Trusted Computer System Evaluation Criteria (orange book)
TCT To Challenge Tomorrow
TD Tardive Dyskinesia
TD TouchDown
TD Treasury Department
TDCC Transportation Data Coordinating Committee
TDE Transition Diagram Editor
TDI Trusted Database Interpretation
TDM Time-Division Multiplexer
TDR Time Domain Reflectometer
TDRS Tracking and Data Relay Satellite [Space]
TDRSS Tracking and Data Relay Satellite System [Space]
TDY Temporary DutY
TECO Tape Editor and COrrector
TECO Text Editor and COrrector
TEFLON polyTEtraFLuOrethyleNe
TES Thermal Emission Spectrometer (on Mars Observer) [Space]
TFP Tops Filing Protocol
TFS Translucent File System
TFT The Fantasy Trip
TFT Thin Film Transistor
TG Thieves' Guild
TGV Tres Grande Vitesse (French, Very High Speed) [Railroading]
TGV Two Guys and a VAX (humorous variant) [Corporate name]
THIEF THief Isn't Even Fine
THIEF This Here Isn't Even Fine
THOR Tandy High-intensity Optical Recording
TI Texas Instruments
TIA Thanks In Advance [Net jargon]
TIA Transient Ischemic Attack
TIC TermInfo Compiler
TID Ter In Die (three times a day)
TID Transaction ID
TIFF Tag Image File Format
TIP Terminal Interface Processor [ARPANET/MILNET] (replaced by TAC)
TIS Trusted Information Systems [Corporate name]
TISN Tokyo International Science Network (Japan)
TKO Technical Knock Out [Boxing]
TL Total Loss
TLA Three Letter Acronym
TLC Tender Loving Care
TLI Transort-Level Interface
TM TradeMark
TMA Tycho Magnetic Anomaly (movie 2001)
TMAC Treasury department's Multiuser Acquisition Contract
TMIS Telecommunications Management Information System
TMO Telephone Money Order
TMP The Morrow Project
TMRC Tech Model Railroad Club [MIT]
TMRC Transportation Modeling Research Center (TMRC {above} alter ego)
TN Tennessee
TN Twisted Nematic
TNC Threaded Neill Concelman (connector) [Electronics] (see also BNC)
TNF Tumor Necrosis Factor [Biology, Medicine]
TNP Tech Nickel Plate (RR) [TMRC]
TNT TriNitro Toluene
TO Telegraph Office
TO Turn Over
TODS Transactions on Database Systems (ACM)
TOMS Total Ozone Mapping Spectrometer [Space]
TOMS Transactions on Mathematical Software (ACM)
TOOIS Transactions on Office Information Systems (ACM)
TOP Technical Office Protocol
TOPLAS Transactions on Programming Languages and Systems (ACM)
TOPS Traffic Operator Position System [Telephony]
TOPSMP Traffic Operator Position System Multipurpose [Telephony]
TORES Text ORiented Editing System
TOS Transfer Orbit Stage [Space]
TOW Tube launched, Optically tracked, and Wire guided
TOY Time Of Year (clock)
TP Transaction Processing
TP Transport Protocol (ISO/CCITT Transport Services (TP0-TP4); like TCP)
TP4 Transport Protocol, class 4 [ISO]
TPC The Phone Company (from classic movie: _The President's Analyst_)
TPI Tracks Per Inch
TPO Traveling Post Office
TPP TetraarylPorPhyrin
TPS Technical Publishing Software
TPS TeleProcessing Services
TPS Thermal Protection System [Space]
TR Tech Report (at least at LCS (q.v.), maybe others)
TR Technical Reference [Bell, Telephony]
TRG Tip and Ring Ground (test) [Telephony]
TROFF Text RunOFF, text formatter
TRUSIX TRUSted unIX
TRW Thompson, Ramo, and Woolridge
TS Top Secret
TSAP Transport Service Access Point [OSI, Networking]
TSD Total System Design
TSP Teleprocessing Services Program
TSP Thrift Savings Plan
TSP Time Synchronization Protocol
TSP TriSodium Phosphate
TSR TSR (Fortune 500 Company that manufactures Dungeons & Dragons)
TSS Tethered Satellite System [Space]
TSTO Two Stage to Orbit [Space]
T&T Tunnels & Trolls
TTFN Tah Tah, For Now
TTL Transistor Transistor Logic
TTMA Tennessee Tech Microcomputer Association
TTU Tennessee Technological University
TTY TeleTYpe
TUNIS Toronto UNIversity System
TV TeleVision
TVA Tennessee Valley Authority
TW Thieves' World
TWA Trans World Airlines [Corporate name]
TWB Terrestrial WideBand [Networking, DARPA]
TWIMC To Whom It May Concern
TWT Traveling Wave Tube
TWX TeletypeWriter eXchange
TX Texas
Tx Transmit
u (representing the greek mu) - micro
U Universe
UA United Artists
UAR United Arab Republic
UAR User Action Routine
UARS Upper Atmosphere Research Satellite [Space]
UART Universal Asynchronous Receiver Transmitter
UBA UniBus Adapter [DEC]
UBC Universal Bibliographic Control
UBC University of British Columbia
UBM Unpressurized Berthing Mechanism [Space]
UCAR University Corporation for Atmospheric Research
UCB University of California at Berkeley
UCD Uniform Call Distributor [Telephony]
UCD University of California at Davis
UCI University of California at Irvine
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 [Space]
UDP User Datagram Protocol
UEC User Environment Component
UFO Unidentified Flying Object [Space]
UGC Uppsala General Catalog [Space]
UH Upper Half
UHF Ultra High Frequency (300-3000MHz)
UID Unique IDentifier
UID User IDentification [UNIX]
UIMS User Interface Management System
UIT Ultraviolet Imaging Telescope (Astro package) [Space]
UIUC University of Illinois at Urbana-Champaign
UK United Kingdom
UKST United Kingdom Schmidt Telescope [Space]
UL Underwriters Laboratory
ULANA Unified Local-Area Network Architecture
UMOC Ugliest Man On Campus [MIT]
UMT Universal Military Training
UN United Nations
UNESCO United Nations Educational, Scientific, & Cultural Organization
UNICEF United Nations International Children's Emergency Fund (now United Nat. Child. Fund)
UNICS UNiplex Information Computer Services
UNIX Not an acronym at all. Was a joke on MIT's MULTICS.
UNMA Unified Network Management Architecture [AT&T]
UNO United Nations Organization
UP Union Pacific [Railroading, Corporate name]
UPC Universal Product Code
UPI United Press International
UPI United Press International [Corporate name]
UPS Uninterruptible Power Supply
UPS United Parcel Service [Corporate name]
UR University of Rochester
URI University of Rhode Island
US United States (of America)
USA Union of South Africa
USA United States Army
USA United States of America
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
USCG United States Coast Guard
USDA United States Department of Agriculture
USES United States Employment Service
USFL United States Football League
USGS United States Geological Survey
USIA United States Information Agency
USM United States Mail
USMC United States Marine Corps
USMP United States Microgravity Payload [Space]
USN United States Navy
USO United Service Organizations
USO Unix Software Operation
USP United States Pharmacopeia
USPS United States Postal Service
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 Universal Time (a.k.a. GMT, UTC, or Zulu Time)
UT University of Tennessee
UT University of Texas
UT UTah
UTC Coordinated Universal Time (a.k.a. UT)
UTC Universal Coordinated Time (a.k.a. UT)
UTnet University of Texas Network
UTP Unshielded Twisted Pair [Telecom, Networking]
UUCP UNIX-to-UNIX Copy Program
UUG Unix User Group
UV UltraViolet
UVS UltraViolet Spectrometer
UW UnderWriter
UW Univ of Wisconsin
VA Veterans Administration
VA Virginia
VAB Vehicle Assembly Building (formerly Vertical Assembly Building) [Space]
VAFB Vandenberg Air Force Base [Space]
VAN Value Added Network (e.g. Tymnet, Telenet, etc)
VANS Value-Added Network Services
VAR Value Added Remarketer (reseller)
VASI Visual Approach Slope Indicator
VAT Value Added Tax
VAX Virtual Address eXtended
VAXBI VAX Bus Interconnect
VC Viet Cong
VC Virtual Circuit
Vcc Voltage (Common Cathode?)
VCM Voice Coil Motor
VCO Voltage Controlled Oscillator
VCR VideoCassette Recorder
VCU Virginia Commonwealth University
VD Venereal Disease (see also STD)
VDFM Virtual Disk File Manager
VDI Virtual Device Interface
VDM Vienna Development Method
VDM Virtual Device Metafile
VDT Video Display Terminal
VEEGA Venus-Earth-Earth Gravity Assist (Galileo flight path) [Space]
VF Video Frequency
VF Voice Frequency
VFO Variable Frequency Oscillator
VFR Visual Flight Rules [Aviation]
VFW Veterans of Foreign Wars
VFW Volunteer Fire Department
VG Very Good
VG Vicar-General
VGA Video Graphics Array
Vgg Voltage (Gate to Ground?)
V&H Vertical and Horizontal (CO coordinate tape) [Telephony]
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
VILE VI Like Emacs
VINE Vine Is Not Emacs
VIP Very Important Person
VISTA Volunteers In Service To America
VITA Vme International Trade Association
VJ Video Jockey
VL Vulgar Latin
VLA Very Large Array [Space]
VLBA Very Long Baseline Array [Space]
VLBI Very Long Baseline Interferometry [Space]
VLF Very Low Frequency (3-30KHz)
VLIW Very Long Instruction Word
VLSI Very Large Scale Integration
VLT Very Large Telescope [Space]
VM Virtual Memory
VM/CMS Virtual Machine/Conversational Monitor System
VMM Virtual Memory Manager
VMOS Vertical Metal Oxide Semiconductor (V-MOS) (see MOS)
VMR Vertical Market Reseller
VMS Vertical Motion Simulator [Space]
VMS Virtual Memory System [DEC]
VOA Voice Of America
VOIR Venus Orbiting Imaging Radar (superseded by VRM) [Space]
VOIS Voice-Operated Information System
VOQ Visiting Officer's Quarters
VPI&SU Virginia Polytechnic Institute and State University
VRC Vertical Redundancy Character
VRM Venus Radar Mapper (now called Magellan) [Space]
VRM Virtual Resource Manager
VSAT Very Small Aperture Terminal (satellite dish)
VSX X/open Verification Suite
VTAM Virtual Telecommunications Access Method [IBM]
VTOC Volume Table Of Contents
VTOL Vertical TakeOff and Landing
VTR VideoTape Recorder
VUP Vax Unit of Performance
V&V Villains & Vigilantes
VVSS Vertical Volute Spring Suspension
W West
W Width
WA Washington
WA Western Australia
WAC Womens Air Corps
WAIS Wide Area Information Server
WARC World Administrative Conference
WATS Wide Area Telephone Service
WB Water Ballast
WB WayBill
WBC White Blood Cells
WC Water Closet
WC Without Charge
WCTU Women's Christian Temperance Union
WD White Dwarf [Space]
w.d. will dated [Genealogy]
WECo Western Electric Company [AT&T] (manufacturing arm of AT&T)
WFPC Wide Field / Planetary Camera (on HST) [Space]
WFPCII Replacement for WFPC [Space]
WG Working Group
WH WarHammer
WHBL World Home Bible League
WHCA White House Communications Agency [US Government]
WHO World Health Organization
WI Wisconsin
WIMP Windows/Icons/Mouse Programming(?)
WIPP (nuclear) Waste Isolation Pilot Plant [DOE]
WIS WWMCCS Information System
WITS Washington Interagency Telecommunications System
WIYN Wisconsin / Indiana / Yale / NOAO telescope [Space]
WMSCR Weather Message Switching Center Replacement
WOM Write Only Memory
WOP WithOut Papers [Immigration]
WOPR War Operations Planned Response (from "Wargames" movie)
WORM Write Once, Read Many times
WOW Worlds of Wonder
w.p. will proved [Genealogy]
WP Word Processing
WP Working Paper
WPI Worcester Polytechnic Institute
WSI Wafer Scale Integration
WSMR White Sands Missile Range [Space]
WSW West-SouthWest
WTR Western Test Range [Space]
WU Washington University
WU Western Union
WUPPE Wisconsin Ultraviolet PhotoPolarimter Experiment (Astro package) [Space]
WV West Virginia
WW World War
WWI World War I
WWII World War II
WWMCCS World-Wide Military Command and Control System
WY Wyoming
WYSIWIS What You See Is What I See
WYSIWYG What You See Is What You Get
XCF eXperimental Computing Facility
XD without Dividend
XDR eXternal Data Representation
XFER Transfer
XINU XINU Is Not UNIX
XL eXtra Large
XMM X-ray Multi Mirror [Space]
XMTR transMiTteR (the X is for trans)
XNS Xerox Network Services
XO eXecutive Officer
XOR eXclusive OR (logical function)
XPORT Transport
XSECT cross SECTion
XTAL crysTAL (another version of x for crys, see XMTR)
XUI X-windows User Interface
XUV eXtreme UltraViolet [Space]
YA Yet Another
YACC Yet Another Compiler Compiler
YB YearBook
YMCA Young Mens Christian Association
YMHA Young Mens Hebrew Association
YOB Year Of Birth
YP Yellow Pages
YRS Ysgarth Rules System
YSO Young Stellar Object [Space]
YST Yukon Standard Time
YT Yukon Territory
YT Yukon Time
YTD Year To Date
YWCA Young Womens Christian Association
YWHA Young Womens Hebrew Association
Z Zenith
Z Zero
Z Zulu (time)
ZB Zero Beat
ZETA Zero Energy Thermonuclear Assembly
ZGS Zero Gradient Synchrotron
ZI Zonal Index
ZIF Zero Insertion Force (connector/socket)
ZIP Zone Improvement Plan (US post office code)
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
ZWEI Zwei Was Eine Initially
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