The working title for the GameCube was the Dolphin. As a result, many games from the GameCube era reference this, such as Super Mario Sunshine's setting being in the shape of a dolphin (the island is also named Isle Delfino; "Delfino" is Italian for "Dolphin") and Captain Olimar's ship in Pikmin being named the S.S. Dolphin. The GPU of the machine is named "Flipper", another reference to the console's codename.
Contributed by lividd3ad