Mark of a Hero

The Mark of a Hero is a recurring symbol in the Legend of Zelda series. It is a set of three triangles, similar to the reunited Triforce, that appear on the hand of a hero who is destined to save Hyrule. Unlike the Triforce it does not appear to give its user any added powers save the ability to move and open certain objects

Zelda II: The Adventure of Link
According to the prologue the Mark of a Hero appeared on Link's hand as he approached his sixteenth birthday. Link showed the mark to Impa who brought him to The Door That Does Not Open and used the Mark of a Hero to open the door. Inside Link encountered the sleeping Princess Zelda while Impa recounted the tale that put her in the enchanted sleep. she then gave Link a scroll that only he had the ability to read. The scroll was a message from the deceased King of Hyrule who had casted a spell so that the Mark of a Hero would appear on the person with the right qualities to obtain the Triforce of Courage. The King also revealed how to enter the Great Temple where the Triforce of courage was kept.

The Legend of Zelda: Oracle of Ages and The Legend of Zelda: Oracle of Seasons
In these games the Mark of a Hero appeared on Link's hand after he encountered the Triforce. The back story of the Mark of a Hero is not elaborated on in these games but it is recognized by many characters who state that according to Hyrulian legends the mark appears on the back of the hand of a hero who will save the land of Hyrule. In Oracle of Ages Link encounters Impa who is under attack by a group of Octoroks. The octoroks flee upon seeing Link. Impa states it is because of the mark on his hand. Link also uses the Mark of a Hero to move a stone blocking the entrance to the Forest of Time.