ATR may refer to:

Medicine

Acute transfusion reaction Blood transfusion is the process of transferring blood products into a person's circulation intravenously. Transfusions are used for various medical conditions to replace lost components of the blood. Early transfusions used whole blood, but mod ...

Ataxia telangiectasia and Rad3 related Serine/threonine-protein kinase ATR also known as ataxia telangiectasia and Rad3-related protein (ATR) or FRAP-related protein 1 (FRP1) is an enzyme that, in humans, is encoded by the ''ATR'' gene. It is a large kinase of about 301.66 kDa. ATR bel ...

, a protein involved in DNA damage repair

Science and mathematics

* Advanced Test Reactor, nuclear research reactor at the Idaho National Laboratory, US *

Attenuated total reflectance Attenuated total reflection (ATR) is a sampling technique used in conjunction with infrared spectroscopy which enables samples to be examined directly in the solid or liquid state without further preparation. ATR uses a property of total intern ...

in infrared spectroscopy *

Advanced tongue root In phonetics, advanced tongue root (ATR) and retracted tongue root (RTR) are contrasting states of the root of the tongue during the pronunciation of vowels in some languages, especially in Western and Eastern Africa, but also in Kazakh and ...

, a phonological feature in linguistics * Atractyloside, a toxin and inhibitor of "ADP/ATP translocase" * ATR₀, an axiom system in

reverse mathematics Reverse mathematics is a program in mathematical logic that seeks to determine which axioms are required to prove theorems of mathematics. Its defining method can briefly be described as "going backwards from the theorems to the axioms", in cont ...

Technology

* Answer to reset, a message output by a contact Smart Card *

Automatic target recognition Automatic target recognition (ATR) is the ability for an algorithm or device to recognize targets or other objects based on data obtained from sensors. Target recognition was initially done by using an audible representation of the received signal ...

, recognition ability *

Autothermal reforming Steam reforming or steam methane reforming (SMR) is a method for producing syngas (hydrogen and carbon monoxide) by reaction of hydrocarbons with water. Commonly natural gas is the feedstock. The main purpose of this technology is hydrogen product ...

, a natural gas reforming technology

Transport

ATR (aircraft manufacturer) ATR (French: Avions de transport régional; Italian: Aerei da Trasporto Regionale; or "Regional Transport Airplanes" in English) is a Franco- Italian aircraft manufacturer headquartered in Blagnac, France, a suburb of Toulouse. It was forme ...

an Italian-French aircraft manufacturer **

ATR 42 The ATR 42 is a regional airliner produced by Franco-Italian manufacturer ATR, with final assembly in Toulouse, France. On 4 November 1981, the aircraft was launched with ATR, as a joint venture between French Aérospatiale (now Airbus) a ...

airliner **

ATR 72 The ATR 72 is a twin-engine turboprop, short-haul regional airliner developed and produced in France and Italy by aircraft manufacturer ATR (french: Avions de transport régional or it, Aerei da Trasporto Regionale), a joint venture forme ...

airliner * IATA code for Atar International Airport *

Andaman Trunk Road National Highway 4, or NH 4, is the major highway in the Indian union territory of Andaman and Nicobar Islands. It is 230.7 km in length. This road running from the capital city of Port Blair to Diglipur connecting all major towns of Ferrarg ...

* Air Transport Rack, standards for plug-in electronic modules in aviation and elsewhere; various suppliers e.g.

ARINC Aeronautical Radio, Incorporated (ARINC), established in 1929, was a major provider of transport communications and systems engineering solutions for eight industries: aviation, airports, defense, government, healthcare, networks, security, a ...

Atmore (Amtrak station) Atmore station is a former train station in Atmore, Alabama. It formerly served Amtrak's ''Sunset Limited'' line. It has been closed since 2005, after Amtrak stopped service of the ''Sunset Limited'' east of New Orleans due to the effects of Hurri ...

, Amtrak station code ATR

Music

All That Remains (band) All That Remains is an American heavy metal band from Springfield, Massachusetts, formed in 1998. They have released nine studio albums, a live CD and DVD, and have sold over a million records worldwide. The group currently consists of vocali ...

, an American heavy metal band *

Atari Teenage Riot Atari Teenage Riot (ATR) is a German band formed in Berlin in 1992. Highly political, they fuse left-wing, anarchist and anti-fascist views with punk vocals and a techno sound called digital hardcore, which is a term band member Alec Empire u ...

, a German techno band performing "digital hardcore" music ** ''ATR'' (song), a song by ATR

Organisations

Absent Teacher Reserve Absent Teacher Reserve is a term referring to teachers who are no longer appointed to a specific school, but are reassigned to a school or number of schools within a school district or school system throughout the school year. It may also refer to a ...

, of teachers in New York City *

Americans for Tax Reform Americans for Tax Reform (ATR) is a politically conservative U.S. advocacy group whose stated goal is "a system in which taxes are simpler, flatter, more visible, and lower than they are today." According to ATR, "The government's power to contr ...

Anglican Theological Review The ''Anglican Theological Review'' is the "unofficial journal of the seminaries of the Episcopal Church in the United States and the Anglican Church of Canada." Issues include peer-reviewed articles, poetry submissions, and book reviews. The journ ...

Other

African Traditional Religion The traditional beliefs and practices of African people are highly diverse beliefs that include various ethnic religions.Encyclopedia of African Religion (Sage, 2009) Molefi Kete Asante Generally, these traditions are oral rather than scriptur ...

* ATR: All Terrain Racing, a video game * ATR.1 certificate, in trade between EU and Turkey *

ATR (company) ATR (Auto-Teile-Ring, English: “Spare Parts Pool”) is the corporate umbrella of one of the world's largest independent trading cooperations for automotive spare parts and a service center for four garage service concepts. The headquarters of ...

(''Auto-Teile-Ring''), Germany * Average True Range, a market volatility indicator * ATR (TV channel), a Crimean Tatar TV Channel in Ukraine {{disambiguation