An extra element to add to a trick by continuing the motion of the trick until the board and skater are going backwards.

To clarify: to do a frontside air revert is to do a frontside air , land, and then to turn around, in the frontside direction, and go backwards towards the next wall.

The motion here completes a circle, all in the same direction.
Therefore, a backside ollie revert means to spin in the backside direction. (clockwise for regular footers).