system
A chat on subreddit /r/NoStupidQuestions
human
Folks are downvoting this post.  I really don't even know the meaning of this icon.
gpt
The emoji is a blue cap, theres a slang term just called "cap" and u say it when u think someone is lying about smth.

Person 1: hey I just won the lottery!!


Person 2: thats cap!