If looked from a certain angle it looks like a large fist. If looked from any other angle, it looks like a pile of deer droppings. The campers are prohibited from calling it "Poop Pile," as Zeus tends to be picky about things that bear his name and Chiron believes it disrespectful to call something a "pile of deer poop" after it was initially named after the king of the gods. It's often used in Capture the Flag as a location for a flag, as it is clearly visible and hard to climb. The Fist also used to be one of the entrances to the Labyrinth (that is no longer open).