TT

TT, Tt, tt, or .tt may refer to:

Gaming

 * Manx TT Super Bike, an arcade racing game by Sega
 * Tourist Trophy (video game), a motorcycle racing game for the PlayStation 2
 * Toontown Online, massively multiplayer online role-playing game by Disney

Music

 * "TT" (song), a song by Twice
 * Tritone, the musical interval of an augmented fourth or diminished fifth
 * Theresa Wayman (born 1980), American musician, stage name TT
 * Tying Tiffany (born 1978), Italian singer, stage name TT

Other arts and entertainment

 * The Dominators (production code: TT), a 1968 Doctor Who serial
 * T.T., a fictional character in the film The Forever Purge
 * Thomas Thorpe (T.T.), the publisher of Shakespeare's sonnets

Business and organizations

 * TT Electronics, a British maker of automotive components
 * Tom Tailor, a German clothing company
 * TT Games, a British software producer
 * TT News Agency, a Swedish news agency
 * TT Technologies, a construction equipment manufacturer
 * ThunderTalk Gaming, a Chinese esports organization
 * Tigerair Australia (former IATA code: TT), a former low-cost airline
 * Toytown Germany, a website for English-speaking foreigners in Germany
 * Order and Justice (abbreviated TT in Lithuanian), a political party in Lithuania

Language

 * Tatar language (ISO 639-1 code)
 * TT, an emoticon indicating tears streaming from the eyes

Medicine

 * Tetanus toxoid, a vaccine to prevent tetanus
 * Thrombin time, a coagulation blood test

Computing

 * .tt, the country code top-level domain for Trinidad and Tobago
 * Template Toolkit, a Perl template engine
 * Transaction translator, a particular unit in USB hubs
 * tt-reduction (truth-table reduction), a kind of transformation used in computability theory
 *  (short for teletype), an HTML presentation element that writes text in monospace font

Other science and technology

 * TT earthing system (terre-terre), a system of electrical earthing
 * Tiny Telephone, a type of phone connector
 * Telegraphic transfer (T/T), a method of transferring money
 * Terrestrial Time, an astronomical time standard

Sports

 * Time trial, in racing sports, a race against the clock to secure the fastest time
 * TT Pro League, a professional association football league for clubs in Trinidad and Tobago

Motorcycle races

 * Isle of Man TT, an annual motor-cycle racing event held on the Isle of Man
 * TT Zero, an Isle of Man TT race for solo motorcycles producing low-emissions
 * Dutch TT, a motorcycling event, held on the last Saturday of June
 * Welsh TT, historic motorcycle road races originally held annually on Pendine Sands, Wales, UK circa 1920
 * Welsh TT, historic motorcycle road races originally held annually at Mynydd Epynt, Wales, UK circa 1950

Transportation

 * Audi TT, a 2-door sports car produced by Audi
 * TT (New York City Subway service), a former New York City Subway service, US

Other uses

 * Therapeutic touch, a pseudoscientific energy therapy
 * TT pistol, a Soviet military automatic pistol designed by Fedor Tokarev
 * TT scale, a niche model railroading scale
 * Trinidad and Tobago (ISO 3166 code)
 * Trust Territory, a former geopolitical status
 * TT bar, a ten tola gold bar
 * Theban Tombs, discoverer of the tombs of Theban Necropolis, Egypt