| Acronym | Definition |
|---|
| TT | Trinidad & Tobago (top-level domain) |
| TT | Tourist Trophy (Isle of Man) |
| TT | Title (assembly language ASM51 assembler control) |
| TT | Twin Turbo |
| TT | The Truth |
| TT | Travel Trailer |
| TT | Tom Tom (drums) |
| TT | The Thing (John Carpenter movie) |
| TT | Talk To |
| TT | Take That (band) |
| TT | Top Ten |
| TT | Transport Tycoon (game) |
| TT | Total Time (aviation) |
| TT | Thermaltake (PC cooling industry) |
| TT | Texas Tech (University) |
| TT | Try This |
| TT | Teen Titans (cartoon) |
| TT | Test Track (Disney attraction) |
| TT | The Titans (game) |
| TT | TeleTubbies |
| TT | Turntable |
| TT | Toyota Tercel |
| TT | TrueType (Microsoft font) |
| TT | Tina Turner (singer) |
| TT | Technology Transfer |
| TT | To Taste (recipes) |
| TT | Tag Team |
| TT | Thoroughbred Times (newsletter) |
| TT | Tank Top (shipbuilding) |
| TT | Tow Truck |
| TT | Turk Telekom (Turkey) |
| TT | Trustee (IRB) |
| TT | TeleText |
| TT | The Trenches (gaming, Half-Life modification) |
| TT | Treatment Technique |
| TT | Trouble Ticket |
| TT | The Two Towers (second Lord of the Rings movie) |
| TT | Trailer Trash |
| TT | Two Towers (second Lord of the Rings movie) |
| TT | Toontown |
| TT | Telegraphic Transfer |
| TT | Torah Tidbits (weekly publication) |
| TT | Triple Threat (Prince tennis racket) |
| TT | Tetanus Toxoid |
| TT | Tractor Trailer |
| TT | Triple Threat (WWE match) |
| TT | Tiny Tim (entertainer) |
| TT | Transition Town (sustainability project community; various locations) |
| TT | Travel & Tourism |
| TT | Troubled Teen |
| TT | Tidningarnas Telegrambyrå (Swedish National News Agency) |
| TT | Trending Topic (Twitter) |
| TT | Three Towns (beer) |
| TT | Tiny Toons (TV Show) |
| TT | Total Tackles (football stat) |
| TT | Text-Telephone (TTY is preferred) |
| TT | Transcription and Translation |
| TT | Thrombin Time |
| TT | timed text |
| TT | Triple Tube |
| TT | Team Talk (web forum) |
| TT | Turing Test (Artificial Intelligence) |
| TT | Totus Tuus (Latin: All Yours; chiefly religious) |
| TT | Teletypewriter |
| TT | Test Temperature |
| TT | Tampa Tribune (Tampa, FL newspaper) |
| TT | Twelve Tribes (Twelve Tribes of Israel) |
| TT | Target Text |
| TT | Temple Terrace (Florida city) |
| TT | Talking Time (call center) |
| TT | Technical Translation |
| TT | Temperature Transmitter |
| TT | Timmy Turner (cartoon character) |
| TT | Transaction Time (call center) |
| TT | Terrestrial Time |
| TT | Target Tracking |
| TT | Triple Time |
| TT | Tyne-Tees |
| TT | Torpedo Tube(s) |
| TT | Temperament Tested |
| TT | Total Temperature |
| TT | TheaterTek (media player) |
| TT | Technology Transition |
| TT | Task Type |
| TT | Turn Time |
| TT | Transition Technologies |
| TT | Tails-Tails (possible outcome for flipping a coin twice) |
| TT | Terminal Transfer |
| TT | Treatment Team |
| TT | Temporary Total Disability (Ohio Bureau of Workers' Compensation) |
| TT | Tri-Tone (music) |
| TT | Traveling Time |
| TT | Timo Tolkki (band) |
| TT | Triple Triad (card game) |
| TT | Tube Trailer |
| TT | Telephone Technician |
| tt | Tatarian (language identifier; RFC 3066) |
| TT | Tank Table |
| TT | Through Tubing |
| TT | Trunk Type |
| TT | Time Trial(s) (racing/sporting events) |
| TT | Treasure Trooper |
| TT | Trenton Thunder (minor leauge baseball) |
| TT | Thornton Tomasetti (structural engineering company) |
| TT | Theutates Thunder (gaming) |
| TT | Townsend Thoresen (UK ferry company) |
| TT | Twin Tub |
| TT | Thurn and Taxis (prominent German family) |
| TT | Transtejo (Lisbon ferry company) |
| TT | Tokyo Toshokan |
| TT | Titan Tower (TV show) |
| TT | Thigh Toner (strength-building exercise) |
| TT | Tube Turns |
| TT | Translation Types |
| TT | Tuberculin Tested (cattle) |
| TT | Torrential Tribute (Yugioh cards) |
| TT | Tactical Terminals |
| TT | Trenton Titans (minor league hockey) |
| TT | TriTube (French) |
| TT | Tyson Tomko (WWE wrestler) |
| TT | Thirty-Two Thirty-Two (Atari computers) |
| TT | TroyTech (Troy High School; Fullerton, CA) |
| TT | Transmit Tip |
| TT | Tula Tokareva (Russian pistol) |
| TT | Trinidadian Dollar |
| TT | Transfer Tree |
| TT | TransiTALK (website) |
| TT | Tundra Times (newspaper) |
| TT | Topical Time (publication, American Topical Association) |
| TT | Troop Test |
| TT | Tracking Technician |
| TT | Teatro Technicus |
| TT | Tandem Turn |
| TT | Todo-O-Terreno (4x4) (Portuguese: All terrain) |
| TT | Teetotal/Teetotaller |
| TT | Tactical Tables |
| TT | DCS/Technical Training (USAF) |
| TT | Technical Test/ing |
| TT | Trailing Tire |
| TT | Trusted Territories |
| TT | Taxi Tran |
| TT | Temperature Transducer |
| TT | Transthoracic |
| TT | Table Top (model railroad scale, 2.5mm = 1 ft. in USA, or 3mm = 1 ft. UK) |
| TT | Tabletop |
| TT | Taco Time (various locations) |
| TT | Twitter Trend |
| TT | Ta Ta |
| TT | Table Tennis |
| TT | Technological Turbulence |