The Triforce is the symbol of Hyrule in The Legend of Zelda series. The Triforce is split into three different parts, which in the games are always borne by the three central characters of the Zelda saga:
Whoever possesses all three parts of the Triforce can have any desire that he or she wants granted, but the effects of this wish upon the rest of Hyrule is largely based on whether the bearer of the Triforce is good or evil.