C1 881512 223960542 2008-07-06T18:32:01Z LHOON 67915 '''C1''' or '''C-1''' may refer to: * C1, an international standard paper size defined in [[ISO 216]] (648×917&nbsp;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) {{disambig}} [[de:C1]] [[el:C-1]] [[fr:C1]] [[ko:C1]] [[it:C1]] [[nl:C1]] [[ja:C1]] [[pl:C-1]]