C2

C2 or C-2 can refer to:

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• C2, Cunningham & Cunningham, a company based in Portland, Oregon, and whose Web site hosts the Portland Pattern Repository, which includes the WikiWikiWeb, the first ever wiki
• Vitamin C2, a name sometimes used for Choline
• Command and Control, an acronym
• C2, an international standard paper size (458×648 mm), defined in ISO 216
• C2, a music imprint distributed by Sony Music
• C2, or Deep C, the C under the bass clef.
• Coca-Cola C2, a soft drink launched by The Coca-Cola Company in 2004
• C2 (protocol), a file transfer protocol
• HMS C2, a British C class submarine of the Royal Navy
• USS C-2, a C-class submarine of the United States Navy
• USS Charleston (C-2), a protected cruiser of the United States Navy
• C-2 Greyhound, The Grumman cargo aircraft of the United States Navy
• Citroën C2, a car produced by Citroën in 2004
• C2 explosive, a form of plastic explosive
• Command and Control, (C²), is the exercise of authority and direction in the military