GC can refer to different things depending on the context. Here are some possible meanings of GC:

• Gas Chromatography: GC is an analytical technique used to separate and analyze compounds that can be vaporized without decomposition. It is applicable to gas, liquid, and solid samples.

• Good Call: In online chat and text messaging, GC can stand for "Good Call." It usually demonstrates agreement with a decision or suggestion.

• Group Chat: GC can also refer to a chat room or conversation involving a group of people, typically within a messaging app like WhatsApp, Facebook Messenger, or Instagram. The purpose of these group chats can vary significantly, from casual conversations among friends and family members to focused discussions for work or educational projects.

• Groovy Cat: GC was adopted as an acronym for "groovy cat" in the 2000s as online chat and texting became more commonplace. It is another way to say "cool dude".

• Gigacycle: In computing, GC can stand for "Garbage Collect" or "Garbage Collection," which is a process of memory management that entails the recovery of memory occupied by redundant objects in a program.

In summary, GC can refer to gas chromatography, good call, group chat, groovy cat, or garbage collection, depending on the context.