TA
- ta – (s) Tamil language (ISO 639-1 code)
- Ta – (s) Tantalum
- TA – (i) Target Acquisition – Teaching Assistant – (s) Tera-ampere – (i) Territorial Army (UK) – (s) Tristan da Cunha (ISO 3166 digram)
- TAA – (i) Transparency Anti-Aliasing – (a) Trans Australia Airlines
- 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
- tah – (s) Tahitian language (ISO 639-2 code)
- TAI – (i) Target 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 Dimensions 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
- TATT – (i) Tired All The Time (medical diagnosis in-joke)
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