An angel drop is a back somersault, generally a layout backflip, performed from hanging off a wall. It can be done with both feet together, climb up into a wall flip style, or off one foot like a swing thru. The angel drop was first popularized when Daniel Ilabaca did one in his Lisses video, although his foot was resting on a pipe and the move has been performed many times on empty walls.
Angel drop 360/Angel drop full - Scott Jackson did a variation of this in his garden training two video video that involved his foot landing on top of the wall before executing the full. This has also been known as the Sackson Swipe.