C1
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'''C1''' or '''C-1''' may refer to:
* C1, an international standard paper size defined in [[ISO 216]] (648×917 mm)
* C1, also known as [[Vlakplaas]], a unit of the South African Police responsible for assassinating opponents of Apartheid during the 1980s
* C1, the first [[cervical vertebrae]] of the vertebral column, in human anatomy
* <math>C^1</math>, in mathematics, refers to the set of all [[continuously differentiable]] functions
* [[C1 Television]], a Mongolian Television Channel
* [[Complement component 1]]
* [[Cytochrome C1]], a protein, precursor to Cytochrome C
* [[note-octave]] C1 in music
* [[NRS social grade]] C1 for the United Kingdom is the lower middle class
* C1, in biochemistry, refers to small molecules with one carbon atom, such as methane, methanol, formaldehyde and formate, carbon dioxide, and carbon monoxide
* 'C1' is the numberplate of the Prime Minister of Australia's official VIP transportation.
* C1, a level in the [[Common European Framework of Reference for Languages]]
* C1, the code for permission to use specific land or premises for hotels, in [[town and country planning in the United Kingdom|town and country planning in the UK]]
* C1, the first of four pure modules taken in the A-Level maths syllabus
* The [[One-way traffic|One-way]] [[traffic sign]], from the [[Vienna Convention on Road Signs and Signals]]
==Computing==
* [[C0 and C1 control codes]] defined in ISO 6429
* [[C1 (protocol)]], a protocol for file transfer, also known as "Punter"
* [[C-One]] single-board microcomputer
* [[Counter-Strike]] "C1", a slang expression from the video game, used to express agreement
* [[TCSEC]] C1 security class
* [[Xenos|ATI C1]], codename of the Xbox 360 GPU "Xenos"
==Vehicles or ships==
* [[AEG C.I]], a German World War I reconnaissance aircraft
* [[BMW C1]], a security scooter with a roof
* [[C-1 Trader]], a cargo-version of the S-2 Tracker anti-submarine warfare aircraft of the United States Navy
* [[Chevrolet Corvette C1]], any model corvette sold from 1953 to 1962, denoted a solid-axle rearend
* [[Citroën C1]], a small car
* [[Douglas C-1]], a cargo/transport airplane produced by Douglas Aircraft for the U.S. Army Air Service starting in 1925
* [[Ford C1 platform]], the Ford Motor Company's global compact car automobile platform
* [[HMS C1]], a C-class submarine of the Royal Navy
* [[Kawasaki C-1]], an indigenous transport aircraft of the Japanese Air Self-Defense Forces
* [[Type C1 ship]], a small cargo vessel built by the United States in large numbers before and during World War II
* [[USS C-1 (SS-9)]], a C-class submarine of the United States Navy
* [[USS Newark (C-1)]], a protected cruiser of the United States Navy
==Sports==
* C1 is an abbreviation for single-person [[Canoe racing|Sprint Canoe]]
* 'C1' was the top category in [[Group C]] sportscar racing, used between 1985 and 1990
* In football, C1 refers to the [[UEFA Champions League]] (formerly known as the European Cup)
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[[ja:C1]]
[[pl:C-1]]