Double shine

A double shine, triple shine or so forth is a move in Melee in which Fox or Falco use their shine, jump-cancel the shine, and then jump-cancel (other definition) the jump into another shine, and repeat the process thereof. This move requires very fast inputs on the controller and is considered very difficult for players to perform.

FreddyP from GameFAQs says of double shine, "Double, triple, quadruple, and so on shine is just shine, jump, shine, jump, shine, etc.

Same for both Fox and Falco, and can be done forever. The important thing is that the next shine has to be done before Fox/Falco leaves the ground after jumping from the previous shine, which is 4 frames for Fox and 6 for Falco. You need insanely fast reflexes to do them, and very very few people can consistently do even a double shine in a match."