TR

TR or tr may stand for

Gaming

 * Tomb Raider, a video game franchise
 * Terminal Reality, an American video game developer
 * A currency in online game TalesRunner
 * Terran Republic (PlanetSide), a faction in the video game series PlanetSide

Music

 * Korg TR, a variant of the Korg Triton music workstation synthesizer
 * Trill, notation for musical ornament
 * TR-808, TR-909 etc., 1980s Roland drum machines

Businesses and organizations

 * Scoot, IATA code since 2017
 * Tiger Airways, IATA code between 2003 and 2017
 * Tomahawk Railway, reporting mark
 * Transbrasil, IATA airline code until 2001
 * Team Rubicon, commonly used abbreviation
 * Talyllyn Railway, a Welsh railway
 * Thomson Reuters, a Canadian multinational media conglomerate
 * Texas Roadhouse, restaurant chain in the United States
 * Tokyu Railways. See Tokyu Corporation.

Language

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

People

 * Theodore Roosevelt, the 26th president of the United States
 * Presidency of Theodore Roosevelt, 1901-1909
 * The USS Theodore Roosevelt (CVN-71), a Nimitz-class aircraft carrier
 * T. Rajendar, Indian filmmaker and politician
 * T. Ramachandran (writer) (1944–2000), Indian writer who wrote under these initials

Places

 * TR postcode area, UK postal code for the Truro area
 * Travelers Rest, South Carolina
 * ISO 3166-1 alpha-2 country code of Turkey
 * Vehicle registration code of Tripura, a state of India

Transportation

 * Taiwan Railway

Biology and medicine

 * Thyroid hormone receptor, a nuclear receptor
 * Tricuspid regurgitation, within the heart
 * Repetition time, magnetic resonance imaging
 * Taxonomic rank

Computing

 * .tr, the country code top level domain (ccTLD) for Turkey
 * tr (Unix), command to translate characters
 * Table row, an HTML element 

Vehicles

 * Thai Rung Union Car
 * Toronto Rocket, a rolling stock of the Toronto subway
 * Triumph Motor Company. a sports car designation, e.g. TR2
 * Ferrari TR (set index), several cars

Other uses in science, technology, finance, and mathematics

 * TR-1, a version of the Lockheed U-2 aircraft
 * Technical Report, a type of ISO document
 * Trace (linear algebra)
 * Ton of refrigeration
 * Total return

Other uses

 * Textus Receptus: Printed Greek New Testament translation sources
 * Training routines (Scientology)
 * Tax return
 * Tax refund