What is "nail-head molding"

Nail-headed \Nail"-head`ed\, a. Having a head like that of a nail; formed so as to resemble the head of a nail.

Nail-headed characters, arrowheaded or cuneiform characters. See under Arrowheaded.

Nail-headed molding (Arch.), an ornament consisting of a series of low four-sided pyramids resembling the heads of large nails; -- called also nail-head molding, or nail-head. It is the same as the simplest form of dogtooth. See Dogtooth.