Forest Medallion

The Forest Medallion is an item in The Legend of Zelda: Ocarina of Time and one of the six Medallions in the game.

In-game
The Forest Medallion is a green circular medallion emblazoned with three swirls, as it might have originally been the Wind Medallion. It is given to Link after defeating Phantom Ganon in the Forest Temple, by the newly awakened Forest Sage, Saria. It has no known purposes besides marking the temples Link has completed, though some have theorized it may have originally had powers or something that could effect gameplay.