Wind Maker

The Wind Maker is a form of the Kingdom Key that will appear along with numerous other forms in the upcoming Kingdom Hearts 358/2 Days.

The Kingdom Key is changed into the Wind Maker when the Wing Gear is equipped. The Wind Maker allows you to perform a series of aerial attacks when used.

It may represent Xaldin, as Sora's Bond of Flame keychain represents Axel, and the Two Across keychain represents Roxas. If this is true, it's possible Roxas will gain more "Gears" (like the Wind Gear) representing the other members as well.