Hmm.. good point. A signature move can be one of three things. It can be a move that for the most part only that wrestler uses (i.e. Orton's hangman DDT, or Taker's Old School). It can also be a move used to set up a finisher (i.e. Morrison's flying chuck); or more often than not, it's both (5 Knuckle Shuffle). I guess it depends on your definition.