User blog comment:KataraFan/Theme Song Messages/@comment-66.60.156.2-20130425170810

I think each symbol is related to a certain charcter.For example

Tree:Dipper

Star:Gidion

Question Mark:Soos

Claw-Like Symbol:Stan

Shooting-Star:Mabel

Heart with cuts:Robbie

Though I'm unsure about the Lama,Glasses and the Ice bag.Me and my sister are guessing they all might be involved with something big later on in the series