C31

C31 or C-31 may be:

C-31 highway (Spain), a primary highway in Catalonia
HMS C31, a 1909 British C class submarine
PRR C31, an American PRR 0-8-0 wheel arrangement steam locomotive
Caldwell 31 (IC 405, the Flaming Star Nebula), an emission/reflection nebula in the constellation Auriga

and also :

an identifier given to the Blackstripe corydoras (Corydoras bondi), a freshwater catfish, prior to its identification
a 1985 amendment to Canada's Indian Act
a molecule important in diapedesis
Channel 31 as in C31 Adelaide and C31 Melbourne, two Australian community television stations
King's Gambit, an Encyclopaedia of Chess Openings code
Malignant neoplasm of accessory sinuses ICD-10 code
C-31A Troopship, a military designation for the Fokker F27-400M Friendship twin turboprop transport

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