Dogtooth

Dogtooth - Diagonal indented pyramid.
Donjon - A great tower or keep.
Dormer - Window placed vertically in sloping roof.

dogtooth - a carved pyramidal ornament; used in 13th century England
foliage, foliation - (architecture) leaf-like architectural ornament ...

With parallel flights rising alternately in opposite directions, without an open well.Dogtooth ...

a rope); Cavetto, (a moulding with a concave profile describing a quater of a circle); Chevron; Cyma recta, (convex to concave); Cyma reversa, or ogee, (concave to convex); Egg and dart (eggs and arrow heads, representing life and death); Dogtooth; ...