ATR may refer to:

Medicine

* Acute transfusion reaction * Ataxia telangiectasia and Rad3 related, a protein involved in DNA damage repair

Science and mathematics

Advanced Test Reactor The Advanced Test Reactor (ATR) is a research reactor at the Idaho National Laboratory, located east of Arco, Idaho. This reactor was designed and is used to test nuclear fuels and materials to be used in power plants, naval propulsion, research ...

, nuclear research reactor at the Idaho National Laboratory, US * Attenuated total reflectance 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 Mon ...

, a phonological feature in linguistics *

Atractyloside Atractyloside (ATR) is a natural, toxic glycoside present in numerous plant species worldwide in the daisy family including '' Atractylis gummifera'' and '' Callilepis laureola'', and it's used for a variety of therapeutic, religious, and toxic ...

, 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 An Answer To Reset (ATR) is a message output by a contact Smart Card conforming to ISO/IEC 7816 standards, following electrical reset of the card's chip by a card reader. The ATR conveys information about the communication parameters proposed by th ...

, 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, 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 for ...

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) and 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 formed ...

airliner * IATA code for Atar International Airport * Andaman Trunk Road * Air Transport Rack, standards for plug-in electronic modules in aviation and elsewhere; various suppliers e.g. ARINC * Atmore (Amtrak station), 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 vocalis ...

, an American heavy metal band * Atari Teenage Riot, a German techno band performing "digital hardcore" music ** ''ATR'' (song), a song by ATR

Organisations

* Absent Teacher Reserve, of teachers in New York City * Americans for Tax Reform * Anglican Theological Review

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 scriptura ...

* ATR: All Terrain Racing, a video game * ATR.1 certificate, in trade between EU and Turkey * ATR (company) (''Auto-Teile-Ring''), Germany * Average True Range, a market volatility indicator * ATR (TV channel), a Crimean Tatar TV Channel in Ukraine {{disambiguation