C78 or variation, may refer to:

Ruy Lopez chess openings ECO code Secondary malignant neoplasm of respiratory and digestive organs ICD-10 code Medical Examination of Young Persons (Non-Industrial Occupations) Convention, 1946 code K&R C (Kernighan and Ritchie C), C programming language standard released in 1978, sometimes called C78, the original widespread version of C Caldwell 78 (NGC 6541), a globular cluster in the constellation Corona Australis C-78 Bobcat, a 1954 military aircraft , WWII Australian armed merchant cruiser , Mexican Navy ship, an Auk-class minesweeper originating in WWII Mauser C78 "zig-zag", single-action revolver handgun 78th edition of Comiket

See also

78 (disambiguation) c (disambiguation)