C21

C-21, C 21, or C21 may mean:

C21 (band), a Danish boy band
C21 (company), a UK based company
C21 Media
C-21 "Douglas Dolphin", a flying boat used by the United States Army Air Corps
HMS C21, a 1909 British C class submarine
Learjet C-21, a United States military version of the Learjet 35A
Sauber C21, a 2002 racing car
Space Adventures C-21, a Myasishchev Design Bureau created design for a suborbital rocketplane for Space Adventures
Anal cancer ICD-10 code
the Encyclopaedia of Chess Openings' classification code for the Center Game chess opening
Caldwell 21 (NGC 4449), an irregular galaxy in the constellation Canes Venatici

See also