GC has multiple meanings and is used in many environments. It is basically written with the first letters of Pinyin, including: observation, rolling, climax, and public toilet.

The first is a computer term, referring to Gabage Collection; the second is a network term, stepping on space, which means "support" in Cantonese vernacular; the third is GC in the network domain, which is the "Global Catalog" Global Catalog; the fourth is scientific research terms, namely Gas Chromatography; the fifth is ML specific terms, namely "high----tide".