infraspace
  Junior Editor

That's a map marker from a game called Skyrim. I think it marks a location for a quest.

That's called Chiron. (Pronounced Kie-ron) It's an astrology thing.

They look a bit like the script used for some Native American languages. The colon and repetition makes it look like a time display.

This is a symbol I created as a kind of signature sigil. If I was into graffiti, it wouldd be my tag I guess. I'm just curious if it already exists in some alphabet, or has some pre-existing meaning.