Wind Crest
From Zelda Wiki.org
Stones with a music note on them that are found in The Minish Cap. These mystic stones, when approached, explode. This reveals a pad of dirt with the same note on it. The first one is found in the end of the Minish Woods, and then they are found all over. Later, the Ocarina of Winds can be used to call Zeffa, who will drop Link off on the note symbol.
The 7 Wind crests and the Ocarina construct the warp system for this game.
