TT

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

Biology and medicine

• Tetanus toxoid, a vaccine to prevent tetanus
• Therapeutic touch, an alternative medicine practice
• Thrombin time, a coagulation blood test

Business and organizations

• TT Electronics, a British maker of automotive components
• TT-Line Company, a ferry company operating from Tasmania to Australia
• TT Games, a British software producer
• TT News Agency, a Swedish news agency
• ThunderTalk Gaming, a Chinese esports organization
• Tigerair Australia's IATA code
• Toytown Germany, a web site for English-speaking foreigners in Germany

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 or truth-table reduction, a kind of transformation used in computability theory
• <tt>...</tt> (short for teletype), an HTML presentation element that writes text in monospace font

Gaming

• Manx TT Super Bike, an arcade racing game by Sega
• Tourist Trophy (video game), a motorcycle racing game for the PlayStation 2

Music

• "TT" (song), a song by Twice
• Theresa Wayman or TT, musician
• Tritone, the musical interval of an augmented fourth or diminished fifth

Sports

• Table tennis
• 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
• 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
• Isle of Man TT, an annual motor-cycle racing event held on the Isle of Man
• 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

Other uses

• Audi TT, a 2-door sports car produced by Audi
• TT earthing system (terre-terre), a system of electrical earthing
• TT pistol, a Soviet military automatic pistol designed by Fedor Tokarev
• TT scale, a niche model railroading scale
• Tatar language's ISO 639-1 code
• Telegraphic transfer or T/T, a method of transferring money
• Terrestrial Time, an astronomical time standard
• Tiny Telephone, a type of phone connector
• Trinidad and Tobago's ISO 3166 digram
• TT, the production code for the 1968 Doctor Who serial The Dominators
• T.T., a fictional character in The Forever Purge
• TT bar, a ten tola gold bar
• Thomas Thorpe, the publisher of Shakespeare's sonnets
• Theban Tombs, discovered tombs of the Theban Necropolis
• TT, an emoticon indicating tears streaming from the eyes

See also

• Atari TT030, a computer based on the Motorola 68030 CPU
• Pi (letter) or Π
• TTT (disambiguation)
• 2T (disambiguation)
• T2 (disambiguation)
• T-square (disambiguation)
• Tourist Trophy (disambiguation)