T

This list contains acronyms, initialisms, and pseudo-blends  that begin with the letter T.

For the purposes of this list:

• acronym = an abbreviation pronounced as if it were a word, e.g., SARS = severe acute respiratory syndrome, pronounced to rhyme with cars
• initialism = an abbreviation pronounced wholly or partly using the names of its constituent letters, e.g., CD = compact disc, pronounced cee dee
• pseudo-blend = an abbreviation whose extra or omitted letters mean that it cannot stand as a true acronym, initialism, or portmanteau (a word formed by combining two or more words).

(a) = acronym, e.g.: SARS – (a) severe acute respiratory syndrome

(i) = initialism, e.g.: CD – (i) compact disc

(p) = pseudo-blend, e.g.: UNIFEM – (p) United Nations Development Fund for Women

(s) = symbol (none of the above, representing and pronounced as something else; for example: MHz – megahertz)

Some terms are spoken as either acronym or initialism, e.g., VoIP, pronounced both as voyp and V-O-I-P.

(Main list of acronyms)

• T – (s) Tera – tesla – tritium

• ta – (s) Tamil language (ISO 639-1 code)
• Ta – (s) Tantalum
• TA
  • (i) Target Acquisition
  • Teaching Assistant
  • (s) teraampere
  • (i) Territorial Army (UK)
  • (s) Tristan da Cunha (ISO 3166 digram)
• TAA
  • (i) Transparency Anti-Aliasing
  • (a) Trans Australia Airlines
• TAAC – (i/a) Trans America Athletic Conference, the original name for the US college sports league now known as the ASUN Conference
• TAACOM – (p) U.S. Theater Army Area Command
• TAADCOORD – (p) Theatre Army Air Defence Co-ordinator
• TAAR – (i) Trace Amine-Associated Receptor
• TAC – (a) U.S. Tactical Air Command (1946–1992)
• TACAMO – (p) Take Charge and Move Out (U.S. military)
• TACAN – (p) Tactical Air Navigation
• TACC
  • (i) Tactical Air Control Centre
  • (USAF) Tanker Airlift Control Center
• TACCO – (p) Tactical Coordinator
• TACCSF – (i) U.S. Theater Aerospace Command & Control Simulation Facility
• TACDAR – (p) Tactical Detection And Reporting
• TACP – (i) Tactical Air Control Party – Technology Applications Certification Program
• TACSOP – (p) Tactical SOP (Standing Operating Procedure)
• TADIL – (p) Tactical Digital Information Link
• TADL – (a) Tactical Air Data Link ("taddle")
• TADSS – (i) Training Aids, Devices, Simulators, and Simulations
• TAF - (i) Trading Activity Fee assessed by FINRA to recover the costs of supervising and regulating firms.
• tah – (s) Tahitian language (ISO 639-2 code)
• TAI – (i) Target[ed] Area of Interest
• TAJ – (i) Tom and Jerry
• TAJT – (i) Tom and Jerry Tales
• TALES – (a) Technical Advice and Lexicon for Enabling Simulation
• tam – (s) Tamil language (ISO 639-2 code)
• TAN – (s) Tanzania (IOC and FIFA trigram, but not ISO 3166)
• TANJ – (a) There Ain't No Justice (used as expletive in the Ringworld novels)
• TANP – (i) Terrain-Aware Network Planner
• TANSTAAFL – (a) There Ain't No Such Thing As A Free Lunch (coined by author Robert A. Heinlein in his The Moon Is a Harsh Mistress)
• TAPPS – (a) Texas Association of Private and Parochial Schools
• TARDIS – (a) Time And Relative Dimension In Space (from Doctor Who)
• TARP – (a) Transparency Accountability Rights for Parents (coined by Karen Plumridge, founder of Black Ribbon Gold Heart)
• TAROT – (a) Télescope à action rapide pour les objets transitoires (French, "Transient Object Rapid Action Telescope")
• TAS – Tasmania (postal symbol)
• TASER – (a) Thomas A. Swift's Electric Rifle
• TASM – (i) Tactical Air-to-Surface Missile
• tat – (s) Tatar language (ISO 639-2 code)
• TAT – (i) Tourism Authority of Thailand
• TATP – (p) TriAcetone TriPeroxide
• TADC - (i) The Amazing Digital Circus

• Tb – (s) Terbium
• TB – (p) Tuberculosis
• TBA – (i) to be announced
• TBBPA – (p) TetraBromoBisPhenol-A
• TBC – (i) to be confirmed, to be continued
• TBD – (i) "to be documented", "to be determined", or "to be decided"
• TBD – (i) Torpedo Boat Destroyer
• TBF – to be fair
• TBGRI – (i) Tropical Botanic Garden and Research Institute, India
• TBH – (i) to be honest
• TBL – (i) Turkish Basketball League
• TBM – (i) tactical ballistic missile, theatre ballistic missile
• TBS – (i) Turner Broadcasting System
• TBT – (p) Tributyltin

• TCC – (s) Tarrant County College
• Tc – (s) Technetium
• TC – (s) Teracoulomb – Turks and Caicos (ISO 3166 digram) – United Arab Emirates (FIPS 10-4 country code; from Trucial Coast States)
• TCA – (i) Transformational Communications Architecture – (s) Turks and Caicos (ISO 3166 trigram)
• TCAS – (i) Traffic Collision Avoidance System
• TCAA – (i) Top Counter-Assault Agents
• TCBY - (i) The Country's Best Yogurt
• TCCCS – (i/a) Tactical Command, Control, and Communications System ("ticks")
• TCD – (s) Chad (ISO 3166 trigram)
• TCG – (i) Trusted Computing Group – Türkiye Cumhuriyeti Gemisi
• TCHD – (i) Truck Cargo Heavy Duty
• TCL – (i) Tool Command Language
• TCM – (i) Turner Classic Movies
• TCP – (i) Traffic Control Point – Transmission Control Protocol – Trichlorophenol
• TCU – (i) Texas Christian University
• TCWMS – (i) Tele-Center Workforce Management System
• TCW – (i) Tasty Coma Wife

• te – (s) Telugu language (ISO 639-1 code)
• Te – (s) Tellurium
• TE – (i) Tactical Exploitation – (p) Testosterone to Epitestosterone ratio – (i) Tight end (American football; position generally not used in modern Canadian football)
• TEAL – (a) Tasman Empire Airways Limited
• Team – (a) Together everyone achieves more
• TEAMS – (a) The East African Marine System (fiber optic cable)
• TED – (a) Technology Entertainment Design prize
• TEEL – parts of a body paragraph in an essay:^[1][2][3] * T - Topic sentence E - Explanation E - Evidence L - Link
• TEETH – (a) Tried Everything Else, Try Homeopathy (medical diagnosis in-joke)
• tel – (s) Telugu language (ISO 639-2 code)
• TEL – (a/i) Transporter, Erector and Launcher
• TELAR – (a) Transporter, Erector, Launcher And Radar
• TEMO – (a) Training, Exercise, and Military Operations
• TENCAP – (p) Tactical Exploitation of National Capabilities
• TER's(Stargate) – Transphase Emission Rods
• TERS – (i) Tactical Event Reporting System
• TES – (i) Tactical Event System
• TEST – (a) Thesaurus of Engineering and Scientific Terms
• TEU – (i) Twenty-foot equivalent unit (cargo capacity)
• TeVeS – (p) Tensor Vector Scalar theory

• TF –
  • (s) French Southern Territories (ISO 3166 digram)
  • (i) Task Force
  • (s) Terafarad
  • (?) Too Far
  • (i) Team fortress (hence TF2 is Team Fortress 2)
  • Transformers
• T/F – (i) True/False (=Yes/No)
• TFG
  • (i) Task Force Games (defunct tabletop game company)
  • Tiny Friendly Giant (automobile engine developed by Koenigsegg)
  • Transferoviar Grup (Romanian railway company)
• TFMPP – (p) Trifluorophenylmethylpiperazine
• TFR – (i) Total Fertility Rate
• TFT – (i) Thin-Film Transistor
• TFTP –
  • (i) Trivial File Transfer Protocol
  • (i) Terrorist Finance Tracking Program

• tg – (s) Tajik language (ISO 639-1 code)
• Tg – (s) Teragram
• TG – (s) Togo (ISO 3166 digram)
• TGA – (s) Tonga (IOC and FIFA trigram, but not ISO 3166)
• TGB – (i) Tres grande bibliothèque (French, "Very Large Library"), a sarcastic nickname for the Bibliothèque nationale de France
• TGIF – (i) Thank God It's Friday, Toes Go In First
• tgk – (s) Tajik language (ISO 639-2 code)
• tgl – (s) Tagalog language (ISO 639-2 code)
• TGO – (s) Togo (ISO 3166 trigram)
• TGT
  • (p) Target (also the ticker symbol for Target Corporation)
  • (i) Ticket Granting Ticket (computer security)
  • (i) Tyrese, Ginuwine, Tank – see TGT (group) for their collaboration
• TGV
  • (i) Tanjong Golden Village (Malaysian cinema chain)
  • (p) Tanora malaGasy Vonona (Malagasy, "Young Malagasies Determined" – political party)
  • (i) Test Generation with Verification
  • Train à grande vitesse (French for "High-Speed Train")

• th – (s) Thai language (ISO 639-1 code)
• Th – (s) Thorium
• TH – (s) Terahenry – Thailand (ISO 3166 and FIPS 10-4 country code digram)
• tha – (s) Thai language (ISO 639-2 code)
• THA – (s) Thailand (ISO 3166 trigram)
• THAAD – (a/i) Terminal High Altitude Area Defence
• THB – (s) Thai baht (ISO 4217 currency code)
• THEGENTRY – (a) The High-End Group of Earth's New Technologies Research Yield
• THEL – (a) Tactical High Energy Laser ACTD
• THG – (p) Tetrahydrogestrinone
• ThG – (p) Graduate of Theology
• THSU - (a) Texas Health and Science University

• ti – (s) Tigrinya language (ISO 639-1 code)
• Ti – (s) Tebi – Titanium
• TI – (s) Tajikistan (FIPS 10-4 country code) – (i) Thermal Imaging – Threat Identification – Training Instructor – Texas Instruments
• TIA – (i) Total Information Awareness initiative
• TIA – (i) Transient Ischemic Attack
• TIALD – (i) Thermal Imaging and Airborne Laser Designation
• TIAA-CREF – (i, pronounced as "T-I-A-A-cref") Teachers Insurance and Annuity Association – College Retirement Equities Fund
• TIBS – (a) Tactical Information Broadcast System
• TIC – (a) Troops In Contact
• TID – (p) Target Identification – (i) ter in die (Latin, "three times daily")
• TIGERS – (a) Topologically Integrated Geographic Encoding and Referencing System
• TIM – (a) Technical Information Memorandum – Technical Interchange Meeting – Toxic Industrial Material – Telecom Italia Mobile
• TIMS – (a) Tactical Internet Management System – The Institute of Management Sciences – The International Molinological Society – Thermal Infrared Multispectral Scanner – Thermal Ionization Mass Spectrometry – Travel Information Management Services – Tuberculosis Information Management System
• TINC – (a) There Is No Cabal
• TINY – That Is, Not You (internet slang)
• TIP – (a) Thermal Identification Panel
• tir – (s) Tigrinya language (ISO 639-2 code)
• tits – Toes in the Sand

• TJ – (s) Tajikistan (ISO 3166 digram) – Terajoule
• TJD – (i) Truncated Julian Day
• TJK – (s) Tajikistan (ISO 3166 trigram)
• TJS – (s) Tajik somoni (ISO 4217 currency code)

• tk – (s) Turkmen language (ISO 639-1 code)
• TK – (s) Terakelvin – Tokelau (ISO 3166 digram)
• TKBL – (i) Türkiye 1. Kadınlar Basketbol Ligi, the Turkish-language name of the Turkish Women's Basketball League
• TKL – (s) Tokelau (ISO 3166 trigram)
• TKM – (s) Turkmenistan (ISO 3166 trigram)

• tl – (s) Tagalog language (ISO 639-1 code)
• Tl – (s) Thallium
• TLPM – T1 Line Performance Monitor
• TL
  • (i) Team Leader
  • (s) Teralitre
  • Timor-Leste (ISO 3166 digram)
  • (p) ThermoLuminescence
• TL;DR (i) – Too long; didn't read
• TLATOJL – The Life and Times of Juniper Lee
• TLA
  • (i) Three-Letter Abbreviation/Acronym
  • (ii) 'Three-Letter Agency' (i.e. CIA, FBI, NSA, etc.)
  • (i) Temporal light artefacts
• TLAC
  • (i) Total Loss Absorbency Capacity
  • (ii) The Light Aircraft Company
• TLAM – (i) Tomahawk Land Attack Missile
• TLAR
  • (i) That Looks About Right (chat shorthand)
  • (ii) Transporter-Launcher And Radar
• TLC
  • (i) Tender Loving Care
  • The Learning Channel (now known strictly by the initials)
  • Thin-layer chromatography
  • T-Boz, Lefteye, Chilli
  • Tables, Ladders, and Chairs (type of professional wrestling match)
• TLD
  • (i) Thermoluminescent Dosimeter
  • Top-Level Domain
• TLE
  • (i) Temporal light effects
• TLI
  • (i) Temporal light interference
• TLM
  • (i) Traditional Latin Mass
  • Tridentine Latin Mass
  • Transaction Lifecycle Management
  • (i) Temporal light modulation
• TLS
  • (s) Timor-Leste (ISO 3166 trigram)
  • (i) Times Literary Supplement

• Tm
  • (s) Terameter
  • Thulium
• TM
  • (i) Technical Manual
  • Theater Missile
  • Thematic Mapper
  • (p) trademark (often written in small superscript type: ^TM or ™)
  • (i) Turing machine
  • (s) Turkmenistan (ISO 3166 digram) Tympanic Membrane
• TMA
  • (i) Terminal Maneuvering Area (restricted flying zone)
  • Texas Medical Association
  • Tristeza y muerte de agave (Spanish, "wilting and death of agave") – a disease affecting the blue agave, from which the popular spirit tequila is produced
• TMAP – (a/i) Texas Medication Algorithm Project
• TMC – (i) The Movie Channel
• TMD – (i) Theater Missile Defense
• TMDK – (i) The Mighty Don't Kneel (Australian professional wrestling stable also active in Japan)
• TMI – (i) Too Much Information
• TMJ – (i) TemporoMandibular Joint (syndrome)
• TMM – (s) Turkmen manat (ISO 4217 currency code)
• TMNT – (i) Teenage Mutant Ninja Turtles
• TMO
  • (i) Table Mountain Observatory
  • Television match official (rugby union)
• TMP
  • (s) East Timor (ISO 3166 trigram; obsolete 2002)
  • (p) Temporary
• TMPG – (i) Transparent Multiplatform Gateway
• TMR – (i) Twin Main Rotors (helicopter type)
• TMS – (i) Transcranial Magnetic Stimulation
• TMT – (i) Thirty Meter Telescope
• TMTOWTDI – (i) There's More Than One Way To Do It (from Perl)
• TMZ – (i) Thirty-Mile Zone, an area in and around Los Angeles considered "local" under entertainment industry union work rules

• tn – (s) Tswana language (ISO 639-1 code)
• TN
  • (s) Tennessee (postal symbol)
  • Teranewton
  • Tonga (FIPS 10-4 country code)
  • Tunisia (ISO 3166 digram)
• TNA – (i) Total Nonstop Action Wrestling, a former name of the professional wrestling promotion now known as Impact Wrestling
• TND – (s) Tunisian dinar (ISO 4217 currency code)
• TNO – (i) Trans-Neptunian Object
• TNT
  • (i) Thomas Nationwide Transport, an Australian company that was one of the predecessors to the PostNL (previously TNT N.V) and the current TNT Express
  • (p) TriNitroToluene
  • (a/i) Turner Network Television

• to – (s) Tongan language (ISO 639-1 code)
• T/O – (i) Theatre of Operations
• TO
  • (s) Togo (FIPS 10-4 country code)
  • Tonga (ISO 3166 digram)
• TOA
  • (i) Table Of Authorities
  • Total Obligation Authority (accounting)
• TOAD
  • (a) Temporary, Obsolete, Abandoned, or Derelict site (urbanism)
  • Towed Optical Assessment Device
• TOBS – (a) Time of OBServation
• TOC
  • (a/i) Table Of Contents
  • Tactical Operations Centre
  • (i) Temporo-Occipital transition Cortex
  • Top of Concrete
• To-do – (s) To-do-List
• TOG – (s) Togo (IOC and FIFA trigram, but not ISO 3166)
• TOGS – (a) Thermal Observation Gunnery Sight
• TOMS – (a) Total Ozone Mapping Spectrometer (satellite instrument)
• ton – (s) Tongan language (ISO 639-2 code)
• TON – (s) Tonga (ISO 3166 trigram)
• TOP – (s) Tongan pa'anga (ISO 4217 currency code)
• TOS
  • (a) Tape Operating System
  • Terms of service
  • The Original Series, used to distinguish the first Star Trek TV series from other parts of the media franchise
  • Tramiel Operating System
• TOT – (i) Time On Target
• TOW – (a) Tube-launched, Optically tracked, Wire-guided (anti-tank missile)

• TP
  • (s) East Timor (ISO 3166 digram; obsolete 2002)
  • São Tomé and Príncipe (FIPS 10-4 country code)
  • (i) Training Practice
  • Trident Ploughshares
• TPE – (s) Chinese Taipei (IOC and FIFA trigram for the country also known as Taiwan)
• TPI – (i) The point is
• TPO – (p) Thrombopoietin
• TPS – (i) The Pennington School
• TPTB – (i) The Powers That Be (often used to refer to the people responsible for the content of TV series or movies)

• TQ – (i) Top Qualifier (similar to Pole Position in car racing)

• tr – (s) Turkish language (ISO 639-1 code)
• TR – (s) Turkey (ISO 3166 digram)
• TRA – (i) Technology Readiness Assessment
• TRAC – (p) (U.S. Army) TRADOC Analysis Center
• TRACON – (a) Terminal Radar Approach Control
• TRADOC – (p) (U.S. Army) Training and Doctrine Command
• TRAIN – (p) Tourist Railway Association, Inc.
• TRANSCOM – (p) U.S. Transportation Command
• TRAP – (p) Tactical Receive equipment and related Applications
• TRASANA – (p) TRADOC Systems Analysis Agency
• TRD – (i) Towed Radar Decoy
• TRIGAT – (p) Third Generation Antitank (missile)
• TRIPS - (a) Trade-Related Aspects of Intellectual Property Rights
• TRL – (i) Technology readiness level
• Trp – (s) Troop
• TRP
  • (i) Target Reference Point
  • (p) Time of Reporting
• TRPF – (i) Tendency of the rate of profit to fall
• TRU – (a) Transuranic
• TRUEX – (p) Training in Urban Environment Exercise
• TRW – (i) Thompson Ramo Wooldridge Inc.
• TRY – (s) Turkish lira (ISO 4217 currency code)

• ts – (s) Tsonga language (ISO 639-1 code)
• Ts – (s) Terasecond
• TS
  • (s) Terasiemens
  • Thunderstorm (METAR code)
  • Tunisia (FIPS 10-4 country code)
  • (i) TinySex
  • Transsexual
  • (i) "Tough Sh*t"
• TSA
  • (i) Theatre Storage Area
  • Time Slot Allocation
  • Transportation Security Administration
  • The Salvation Army
• TSCA – (a) Toxic Substances Control Act ("tosca")
• TSEC – (i) Transmission Security Encryption Code
• TSL – (i) Transportation Security Laboratory
• tsn – (s) Tswana language (ISO 639-2 code)
• TSN
  • (i) The Sporting News (historic name of the periodical now known as Sporting News)
  • The Sports Network
• tso – (s) Tsonga language (ISO 639-2 code)
• TSO
  • (i) The Stationery Office (was HMSO until 1996)
  • (U.S.) TRICARE Support Office
  • (i) Trans-Siberian Orchestra (band)
• TSOP
  • (i) Tactical Standing Operation Procedure
  • The Sound of Philadelphia (classic 1970s R&B instrumental)
• TSR – many, including terminate-and-stay-resident (program)
• TSSIA – (i) the subject says it all

• tt – (s) Tatar language (ISO 639-1 code)
• TT
  • (s) Teratesla
  • (i) Terrestrial Time
  • Tourist Trophy (Motorcycle sport)
  • (s) Trinidad and Tobago (ISO 3166 digram)
• TTBAO - Things To Be Aware Of
• TTCT – Torrance Tests of Creative Thinking
• TTD – (s) Trinidad and Tobago dollar (ISO 4217 currency code)
• TTO – (s) Trinidad and Tobago (ISO 3166 trigram)
• TTFN – (i) Ta Ta For Now
• TTL
  • (i) Tax, Title, License
  • (i) Through-the-lens (photography)
  • Time 'till live
  • Time to live
  • Transistor–transistor logic
• TTP
  • (i) Tactics, Techniques, and Procedures
  • Thrombotic thrombocytopenic purpura
  • Trailer Transfer Point
• TTTEAF – Thomas the Tank Engine and Friends
• TTY – (i) TeleTYpewriter (Printer)
• TTYL – (i) Talk To You Later (Internet slang)
• TTZ – (p) Tetrazolium

• TU – (i) Technische Universität (German for "Technical University") – Thammasat University (Thailand) – (s) Turkey (FIPS 10-4 country code)
• TUC – (i) Trades Union Congress
• TUG – (a) TeX Users Group
• TUI – (a/i) Text-based user interface (cf. CLI), among other uses
• tuk – (s) Turkmen language (ISO 639-2 code)
• TUN – (s) Tunisia (ISO 3166 trigram)
• TUNS – (i) Technical University of Nova Scotia
• Tur – (s) Turkish language (ISO 639-2 code)
• TUR – (s) Turkey (ISO 3166 trigram)
• TUSK – (a) Tank Urban Survival Kit
• TUV – (s) Tuvalu (ISO 3166 trigram)

• Tv – (i) Time value, a designation seen on some camera dials for shutter priority mode
• TV
  • (i) Television
  • (s) Teravolt
  • (i) Transvestite
  • (s) Tuvalu (ISO 3166 and FIPS 10-4 country code digram)
• TVA – (i) Tennessee Valley Authority
• TVG
  • (p/i) Television Games (Network)
  • (i) Tick, Very Good, Often used by School Teachers when marking homework etc. (Tick VG)^[4][5]
• TVR – (i) TreVor (Wilkinson) Racing
• TVS – (i) Tornado vortex signature

• TWA - Trans World Airlines
• tw – (s) Twi language (ISO 639-1 code)
• TW – (s) Republic of China (Taiwan) (ISO 3166 and FIPS 10-4 country code digram) – terawatt
• TWAIN – (a) Technology Without An Interesting Name
• TWD – (s) Taiwan dollar (ISO 4217 currency code)
• TWE – (a) Trans World Entertainment
• twi – (s) Twi language (ISO 639-2 code)
• TWI – (i) The Welding Institute
• TWN – (s) Republic of China (Taiwan) (ISO 3166 trigram)
• TWP – (i) Technical Working Paper
• Twp - township
• TWS – (i) Thermal Weapon Sight – Track While Scan
• TWT - traveling wave tube
• TWX - telex
• TWIP – (a) Take What Insurance Pays – When a surgeon agrees to accept a lower payment than he ordinarily would for a procedure and not charge the patient the difference

• TX – (s) Texas (postal symbol) – Transmit – Turkmenistan (FIPS 10-4 country code)
• TXV – Thermostatic Expansion Valve

• ty
  • (s) Tahitian language (ISO 639-1 code)
  • (i) Thank you (Internet chat abbreviation)
• TYT – wikt:take your time (Internet chat abbreviation)

• TZ – (s) Tanzania (ISO 3166 and FIPS 10-4 country code digram)
• TZA – (s) Tanzania (ISO 3166 trigram)
• TZC – (p) Tetrazolium chloride
• TZS – (s) Tanzanian shilling (ISO 4217 currency code)