User blog comment:PurplePenguin/The Grunkle Stan Mystery/@comment-67.54.173.224-20121226200615

I know, I know, "ANOTHER post about that triangle???". But I think I'm onto something here. I, like many, am guessing that the symbols each stand for an important character on the show:

Question mark:Soos:on Soos's uniform.

Llama:Wendy:Long hair:nature's greatest worriors

Glasses:Unknown

Weird crescent moon with a fish tail:Stan:on his fez

Star with an eye in the middle:Gideon:on his tent

Pine tree:Dipper:on his cap

Shooting rainbow star:Mabel:on her first and most famous sweater

bag of ice:unknown

stitched heart:Robbie:on his hoodie

six finger  hand:the books:on the front of them