The PineTree in the zodiac is the most important symbol to Bill Cipher's Wheel. The other zodiac symbols on his Summoning Wheel also represent people and memories as well, but not as important as the PineTree. [BillDip] don't like? don't read! I don't own Gravity Falls, but I do own the Au I hope I made up. All rights go to its original creator. +++ An Au that I want to start called Symbols Origin. Basically about the origins of Bill's symbols on his summoning wheel and who they represent.