Closed corner, this is when something is blocking the corner of your photo.
Half shape, this is when the subject of the photo is cut in half.
Fused edges, frame, this is when the subject of the photo clips the frame of the photo.
Fused edges, shapes, this is when the edges of two shapes in a photo are connected.
Hidden edge, this is when an object is blocking the edge of another object making it seem like there is no edge.
Split apex, this is when the photo has an awkward split.
Stolen edge, this is when one edge blocks the another and it confuses the viewer.
Antlers, this is when the background looks like a growth on the subject of the photo.
Skimmed edge, this is when a horizontal and vertical edge intersect.