CTR may refer to:

Engineering, science and technology

Counter mode In cryptography, a block cipher mode of operation is an algorithm that uses a block cipher to provide information security such as confidentiality or authenticity. A block cipher by itself is only suitable for the secure cryptographic transform ...

(CTR mode), a cryptographic mode of operation for block ciphers *

X-ray crystal truncation rod X-ray crystal truncation rod scattering is a powerful method in surface science, based on analysis of surface X-ray diffraction (SXRD) patterns from a crystalline surface. For an infinite crystal, the diffracted pattern is concentrated in Dirac del ...

, a technique to measure properties of crystal surfaces * Current transfer ratio, in an

opto-isolator An opto-isolator (also called an optocoupler, photocoupler, or optical isolator) is an electronic component that transfers electrical signals between two isolated circuits by using light. Opto-isolators prevent high voltages from affecting the s ...

device *

Content Threat Removal Content Threat Removal (CTR) is a cybersecurity technology intended to defeat the threat posed by handling digital content in the cyberspace. Unlike other defenses, including antivirus software and sandboxed execution, CTR does not rely on bei ...

, a cyber security technology that defeats content threats

Government

Cooperative Threat Reduction A cooperative (also known as co-operative, coöperative, co-op, or coop) is "an autonomous association of persons united voluntarily to meet their common economic, social and cultural needs and aspirations through a jointly owned and democra ...

, an initiative to secure and dismantle weapons of mass destruction in former Soviet Union states * Currency transaction report, a report about transactions that the Bank Secrecy Act requires U.S. financial institutions to file with the Internal Revenue Service

Media, arts and entertainment

* ''

Contemporary Theatre Review ''Contemporary Theatre Review'' is a quarterly peer-reviewed academic journal published by Routledge and covering all aspects of theatre, live art, performance art, opera, dance, digital performance, activist and applied performance, theatre des ...

'', a British academic journal of performing arts * ''

Crash Team Racing ''Crash Team Racing'' (stylized as ''CTR: Crash Team Racing'') is a 1999 kart racing game developed by Naughty Dog and published by Sony Computer Entertainment for the PlayStation. It is the fourth installment in the ''Crash Bandicoot'' series ...

'', Naughty Dog's 1999 video game for the Sony PlayStation ** ''

Crash Team Racing Nitro-Fueled ''Crash Team Racing Nitro-Fueled'' is a 2019 kart racing game developed by Beenox and published by Activision. The game is a Video game remaster, remastered version of ''Crash Team Racing'' (1999), which was originally developed by Naughty Dog ...

'', its 2019 remake

Medicine

Cardiac resynchronization therapy Cardiac resynchronisation therapy (CRT or CRT-P) is the insertion of electrodes in the left and right ventricles of the heart, as well as on occasion the right atrium, to treat heart failure by coordinating the function of the left and right ...

* Cardio-thoracic ratio, a measure of the size of heart *

Carpal tunnel release Carpal tunnel surgery, also called carpal tunnel release (CTR) and carpal tunnel decompression surgery, is a nerve decompression in which the transverse carpal ligament is divided. It is a surgical treatment for carpal tunnel syndrome (CTS) and re ...

, surgery for treating carpal tunnel syndrome *

Cervico-thoracic ratio The cervico-thoracic ratio (CTR) is a method developed by Norlander et al. for measuring segmental mobility in the spine between the C7 vertebra and the T5 vertebra in flexion. The method has been developed to fulfil clinical demands of quick exam ...

, a measure of segmental mobility in the spine *

Clinical trials registry Preregistration is the practice of registering the hypotheses, methods, or analyses of a scientific study before it is conducted. Clinical trial registration is similar, although it may not require the registration of a study's analysis protocol. F ...

, an official catalog for studies about health interventions, such as drugs

Organizations

* Center for Transportation Research UT Austin, a research center at the University of Texas at Austin, US *

Center for Turbulence Research The Center for Turbulence Research is a research consortium for studying turbulence. It is jointly operated by Stanford University and NASA The National Aeronautics and Space Administration (NASA ) is an independent agencies of the United S ...

, a research institute at Stanford University, US * Correct the Record, an American political action committee which supported Hillary Clinton's 2016 presidential campaign *

Computing-Tabulating-Recording Company The Computing-Tabulating-Recording Company (CTR) was a holding company of manufacturers of record-keeping and measuring systems; it was subsequently known as IBM. In 1911, the financier and noted trust organizer Charles R. Flint, called the ...

, a company that was renamed IBM in 1924

Transport

* Aerolíneas Centauro (

ICAO airline designator This is a list of airline codes. The table lists IATA's two-character airline designators, ICAO's three-character airline designators and the airline call signs (telephony designator). IATA airline designator IATA airline designators, somet ...

: CTR), an airline in Mexico * Cattle Creek Airport (

IATA airport code An IATA airport code, also known as an IATA location identifier, IATA station code, or simply a location identifier, is a unique three-letter geocode designating many airports, cities (with one or more airports) and metropolitan areas (citie ...

: CTR), an airport in Australia * Controlled traffic region, a controlled airspace zone, typically around airports *

Carlton Trail Railway The Carlton Trail Railway is a shortline railway with its headquarters in Prince Albert, Saskatchewan. It is operated by OmniTRAX, an American transportation company in Denver, Colorado. Carlton Trail has been operating on ex-Canadian National ...

, a Saskatchewan, US shortline railway *

Chester railway station Chester railway station is located in Newtown, Chester, England. It was designed by the architect Francis Thompson and opened as a joint station in 1848. From 1875 to 1969, the station was known as ''Chester General'' to distinguish it from C ...

(station code), England

Automobile models

Honda Civic Type R The is a series of hot hatchback and sports sedan models based on the Honda Civic, Civic, developed and produced by Honda since September 1997. The first Civic Type R was the third model to receive Honda's Honda Type R, Type R badge (after the ...

, a car manufactured by Honda *

Ruf CTR The Ruf CTR (Group C, Turbo Ruf) also known as the CTR Yellowbird or simply Yellowbird, is a limited-production, high performance sports car manufactured by German automobile manufacturer Ruf Automobile. Introduced for the 1987 model year and bas ...

, a car by Ruf Automobile of Germany

Other uses

Click-through rate Click-through rate (CTR) is the ratio of clicks on a specific link to the number of times a page, email, or advertisement is shown. It is commonly used to measure the success of an online advertising campaign for a particular website, as well ...

, a measure of the success of an online advertising campaign * "

Choose the right "Choose the right" is a saying or motto among members of the Church of Jesus Christ of Latter-day Saints (LDS Church) that is taught to children and used by members of the church as a reminder to make choices that will help an individual to live r ...

", a common Latter Day Saint saying, often found on a CTR ring * Close target

reconnaissance In military operations, military reconnaissance () or scouting is the exploration of an area by military forces to obtain information about enemy forces, the terrain, and civil activities in the area of operations. In military jargon, reconnai ...

, a military term for scouting in extremely close proximity to the target *

Competitive trail riding Competition is a rivalry where two or more parties strive for a common goal which cannot be shared: where one's gain is the other's loss (an example of which is a zero-sum game). Competition can arise between entities such as organisms, individ ...

, an equestrian sport *

Costa Rica Costa Rica, officially the Republic of Costa Rica, is a country in Central America. It borders Nicaragua to the north, the Caribbean Sea to the northeast, Panama to the southeast, and the Pacific Ocean to the southwest, as well as Maritime bo ...

, ITU country code