Special moves (aka specials) comprise one of the categories of moves. They generally typify a character’s abilities. The Japanese name is hissatsu waza, meaning ‘deadly move’; the term tokushu waza (which literally means ‘special move’) actually refers to command moves.
3D games in particular don’t have much of a distinction between normal moves and special moves; character-specific techniques fall under their own category (see “characteristic” moves).
Super special moves and such are also included as part of this class; the definition is a little unclear, because different games often have their own ways of handling them.
In some games, there are strengthened versions of special moves: greater than special moves, lesser than super special moves. They often take a portion of the super meter, but less than a super special move would.