Definition: Rocker refers to the shaped difference between the top tips of a water ski or wakeboard and the center of the bottom of the ski or board. This is easiest to see when the board or ski is laying on a flat surface and viewed from the side. This shape is called the running surface of a ski.
Rocker affects the performance of the ski or board in the way that the greater the curve, the tighter the turn.
Pronunciation: 'rä-ker