TR

TR or tr may stand for:

In official codes:

• Tiger Airways IATA code (since September 2003)
• Tomahawk Railway
• Transbrasil airline IATA code (to 2001)
• Turkey, the ISO 3166-1 alpha-2 country code
  • .tr, the country code top level domain (ccTLD) for Turkey
• Turkish language, in ISO 639 alpha-2
• TR postcode area, the postal code for the Truro area covering West Cornwall
• Tactical Reconnaissance, a code used for the Lockheed U-2

In history:

• Textus Receptus
• Theodore Roosevelt, the 26th President of the United States
  • The USS Theodore Roosevelt (CVN-71), a Nimitz-class aircraft carrier

In engineering, science and computing:

• the table row HTML element
• tr, a Unix program
• trace (linear algebra), the sum of the main diagonal elements of a square matrix in linear algebra
• The digraph tr
• Transistor
• Texas Red fluorescent dye
• Tons of Refrigeration in Ton#Refrigeration
• Technical report
• Technical review
• the Thyroid hormone receptor is a type of nuclear receptor that is activated by binding thyroid hormone
• an abbreviation for the trityl (triphenylmethane) group in chemistry
• Matrix trace

In medicine:

• 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

In music:

• The Rasmus
• The Resistance, the fifth studio album by the British band Muse
• Terminaator, an Estonian band, has shortened its name as TR
• Trill
• TR-909; TR-808 etc., a series of drum machines made by Roland in the 1980s
• Korg TR, a music workstation synthesizer

In games:

• Tomb Raider, a computer video game series
• Tabula Rasa (computer game), the MMO game made by NCsoft
• TalesRunner, an online game
• Terran Republic, a term used in the MMOFPS computer video game PlanetSide
• True Remembrance, a freeware visual novel

In transportation:

• Talyllyn Railway, the world's first preserved heritage railway in Wales, United Kingdom
• Triumph Motor Company
• Thai Rung Union Car
• Toll Rail division of Toll NZ
• Tranz Rail
• NZR TR class rail engines
• Toronto Rocket (Toronto subway car), an articulted subway car for the Toronto subway system

In sports:

• Texas Rangers (baseball)
• Toronto Raptors

In fashion:

• True Religion, a designer denim company that is often referred to by its initials, TR

In places:

• Toms River, New Jersey
• Travelers Rest, South Carolina, a town in Upstate Greenville County, South Carolina, United States

In other uses:

• Thematic Group Resources, a deprecated title for a group of properties in the National Register of Historic Places
• The Replacements (TV series), a children's television show on the Disney Channel
• Training routines (Scientology), a term used in Scientology
• Team Rocket (Pokémon)
• Trent Reznor
• Trip report
• Vijaya T. Rajendar