TR

TR or tr may stand for:

Arts and entertainment

Gaming

• Tomb Raider, a video game series
• A currency in online game TalesRunner
• The Terran Republic, a faction in the game PlanetSide

Music

• Korg TR, a music workstation synthesizer
• Trill, a musical ornament consisting of a rapid alternation between two adjacent notes
• TR-808, TR-909 etc., a 1980s series of Roland drum machines (for "Transistor Rhythm")

Businesses and organizations

• Talyllyn Railway, the world's first preserved heritage railway in Wales, UK
• Tiger Airways (IATA code TR since September 2003)
• Thomson Reuters, a global company
• Tomahawk Railway (reporting mark TR)
• Transbrasil (IATA airline code TR, to 2001)

Language

• Tr, a digraph
• Turkish language (ISO 639 alpha-1 code "tr")

People

• Theodore Roosevelt, the 26th President of the United States
  • The USS Theodore Roosevelt (CVN-71), a Nimitz-class aircraft carrier
• T. Rajendar, Indian filmmaker and politician

Places

• TR postcode area, UK postal code for the Truro area
• Travelers Rest, South Carolina, US
• Turkey (ISO 3166-1 alpha-2 country code TR)

Science, technology, and mathematics

Biology and medicine

• Thyroid hormone receptor, a nuclear receptor that is activated by binding thyroid hormone
• Tubal reversal, a microsurgery to open and reconnect the fallopian tubes after a tubal ligation procedure
• Tricuspid regurgitation, a leakage of blood within the heart

Computing

• .tr, the country code top level domain (ccTLD) for Turkey
• tr (Unix), a Unix program to translate characters
• Table row, an HTML element
• Transistor, a semiconducting circuit element designed to amplify or switch electronic signals; the basis of digital computing

Vehicles

• NZR TR class locomotive
• Thai Rung Union Car
• USS Theodore Roosevelt (CVN-71), a Nimitz-class aircraft carrier
• Toronto Rocket, rolling stock of the Toronto subway
• Sports cars by the Triumph Motor Company, e.g. Triumph TR2

Other uses in science, technology, and mathematics

• TR-1, a Tactical Reconnaissance version of the Lockheed U-2 aircraft
• Technical Report, a type of ISO document
• Trace (linear algebra), the sum of the main diagonal elements of a square matrix in linear algebra
• Trityl (triphenylmethane) group, in chemistry

Other uses

• Trail, in street names
• Training routines (Scientology)