Jumbo Star

The Jumbo Star is a Power Star-like object that appears in Super Mario 64 and Super Mario 64 DS. In the Nintendo 64 version, it looks like a Power Star that is bigger than usual. In the Nintendo DS version, a tiny rainbow in the form of a circle surrounds it, as well as a few extra sparkles.

The Jumbo Star can be obtained by defeating Bowser in the final Bowser level, Bowser in the Sky. After being defeated, Bowser will vanish, revealing the star. Touching it will end gameplay, showing a cutscene in which Mario transforms into Wing Mario and automatically flies away via a Triple Jump. After returning to Peach's Castle, Mario then uses it to release Princess Peach from the stained glass window she was trapped in above the entrance to the castle.

Reference
Riesen-Stern Grande Stella