TT
- 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)
- 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) 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
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