C1

C1 or C-1 may refer to:

In vehicles

BMW C1, a security scooter with a roof
Citroën C1, a small car
Ford C1 platform, the Ford Motor Company's global compact car automobile platform
Hawker-Siddeley C1 Andover transport aircraft
Kawasaki C-1, an indigeneous transport aircraft of the Japanese Air Self-Defense Forces
C-1 Trader, an anti-submarine warfare aircraft of the United States Navy
HMS C1, a C-class submarine of the Royal Navy
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
AEG C.I, a German World War I reconnaissance aircraft

In computing

C1 (protocol), a protocol for file transfer, also known as "Punter"
C0 and C1 control codes defined in ISO 6429
Counter-Strike "C1", a slang expression from the video game, used to express agreement
TCSEC C1 security class
C-One single-board microcomputer

In other uses

ISO 216 C1, an international standard paper size (648×917 mm)
NRS social grade C1 for the United Kingdom is the lower middle class
Cytochrome C1, a protein, precursor to Cytochrome C
First cervical vertebra of the vertebral column, in human anatomy
note-octave C1 in music
In town and country planning in the UK, C1 is the code for permission to use specific land or premises for hotels

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