Definition of "HC"

(organic chemistry) Initialism of hydrocarbonate.  examples

(organic chemistry, refrigeration) Initialism of hydrocarbon., a class of molecules containing hydrogen and carbon atoms  examples

(sports) Initialism of hockey club.  examples

(fandom slang) Initialism of headcanon.

(music, subculture) Abbreviation of hardcore.  examples

(cycling) Abbreviation of hors categorie. (French HC)  examples

(fandom slang) Alternative letter-case form of hc