TT

TT, Tt, tt, or .tt may refer to:
==Arts and entertainment==
=== Film and television ===
* Teen Titans (TV series), a popular show that aired from 2003-2006
* Today Tonight, an Australian current affairs television program produced by the Seven Network
===Comics===
*Teen Titans, a DC Comics superhero group 
=== Gaming ===
* Manx TT Super Bike, an arcade racing game by Sega
* Transport Tycoon, a computer game by Chris Sawyer
* Traveller's Tales, a British software house
* Toontown Online, a Disney Interactive MMO
* Teen Titans (2005 video game), a video game based in the 2003 TV series, Teen Titans.
* Tourist Trophy (video game), a motorcycle racing game for the PlayStation 2
===Other uses in arts and entertainment===
* TT scale (Table Top scale), a niche model railroading scale
* Tritone, or augmented fourth, a musical interval that spans three whole tones
* "TT" (song), by South Korean girl group Twice
== Business and organizations ==
* TT Electronics, a British maker of automotive components
* TT-Line Company, a ferry company operating from Tasmania to Australia
* Order and Justice (), a Lithuanian political party
* Tidningarnas Telegrambyrå, a Swedish news agency
* Toytown Germany, a web site for English-speaking foreigners in Germany
* Traveller's Tales, a British software producer
*Türk Telekom, a Turkish telephone company
==Science and technology==
===Biology and medicine===
* Tetanus toxoid, a vaccine to prevent tetanus
* Therapeutic touch, an alternative medicine practice
* Thrombin time, a coagulation blood test
===Computing===
* .tt, the country code top-level domain for Trinidad and Tobago
* ..., an HTML presentation element that writes text in monospace font
* Atari TT030, a computer based on the Motorola 68030 CPU
* Template Toolkit, a Perl template engine
* Transaction translator, a particular unit in USB hubs
* TrueType, a font format
* Truth-table reduction (or tt-reduction), a kind of transformation used in computability theory
===Other uses in science and technology===
* Telegraphic transfer (or telex transfer or T/T), a method of transferring money
* Terrestrial Time, an astronomical time standard
* Tiny Telephone, a type of phone connector
== Sports ==
* Table tennis
* Time trial, in racing sports, a race against the clock to secure the fastest time
* Tourist Trophy (disambiguation), several meanings
** 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
* TT Pro League, a professional association football league for clubs in Trinidad and Tobago
* TT Zero, an Isle of Man TT race
== Other uses ==
* "TT", an emoticon indicating tears streaming from the eyes
* Audi TT, a 2-door sports car produced by Audi
* TT bar, a ten tola gold bar traded in 3.75 oz (117 g) weights
* TT pistol, a Soviet military automatic pistol designed by Fedor Tokarev
* Tatar language (ISO 639-1 code)
* Theban Tombs, or discovered tombs of the Theban Necropolis
* Trinidad and Tobago (ISO 3166 digram), an archipelagic state in the southern Caribbean
== See also ==
* Pi (letter); the capital form of the Greek letter, 'Π', resembles 'TT'
* TTT (disambiguation)
*2T (disambiguation)
*T2 (disambiguation)
*T-square (disambiguation), including T-squared