Any air performed on the backside wall of halfpipe.

An air performed on the backside wall of the vert ramp

a move that involves approaching a vertical wall in a backside manner (when your back is facing away from the wall or pool), grabbing the board as you clear the top, and returning to the wall

Any aerial trick performed on the backside wall of the halfpipe.

A trick performed on the backside wall of the halfpipe, grabbing the heel edge of the board with the front hand.