The triforce is the symbol that was used by the hojo clan in ancient japan. It is also commonly use to show three different emotions/states of mind, or three different places. It is also the net of a tetrahedron.
How did I know all of that?
Hmmm.... Enter the gates of Hell and defeat Dark Chuck and you will win your delicious Death Pie. CAUTION: It's very hot... In fact, it's literally on fire.