slat

A thin, narrow strip or bar of wood (lath), metal, or plastic.

(aviation) A control surface that extends forwards and downwards from the leading edge of a wing, leaving a gap between it and the leading edge, in order to modify the airflow around the wing so as to allow flight at a higher angle of attack without stalling, lowering the aircraft's stall speed.

(skiing, slang) A ski.

A thin piece of stone; a slate.