Abbreviation for coo coo ca choo, which means everything is fine; was used for example by The Beatles or during hippies era.

Nowadays, 4xC is used in cannabis culture among stoners as a sign of weed, pot, smoke time, whatever related to smoking marijuana and having a blast!

Solarpunk is a movement focused on a positive, ecological vision for a future where technology is used for human-centric and ecocentric purposes. It is a literary, artistic and aesthetic sub-genre and is also closely tied to eco-political activism. Solarpunk narratives have a distinctly positive and utopian foundation in contrast to the often dystopian visions found within other "punk" science fiction genres.