C81

C81 or C-81 may refer to :

• C81 (album) (1981)
• C-81 (Michigan county highway)
• C-81 Reliant, a 1933 military aircraft
• Campbell Airport's FAA LID code
• Hodgkin's lymphoma's ICD-10 code
• NGC 6352's Caldwell catalog number
• Ruy Lopez's Encyclopaedia of Chess Openings code

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