
The Triforce of Wisdom is one of the three parts of the Triforce, and is the triangle on left, as seen in Ocarina of Time. It embodies wisdom, has been represented by the color blue, and is tied to the Goddess of Water and Wisdom, Nayru. The Triforce of Wisdom was the piece of the Triforce that entered Zelda after Ganondorf entered the Sacred Realm and touched the Triforce, trying to harness its power for himself. It remained forever within her family, being passed on to every new Zelda after her.
In Phantom Hourglass, the Fairy of Wisdom, Neri, is a kind of representative of the Triforce of Wisdom.
Note: For more about the Triforce see Triforce, Trueforce, Triforce of Power, and Triforce of Courage.