nailhead

from WordNet (r) 3.0 (2006)

nailhead
    n 1: something resembling the head of a nail that is used as an
         ornamental device
    2: flattened boss on the end of nail opposite to the point

from The Collaborative International Dictionary of English v.0.48

Nail-headed \Nail"-head`ed\, a.
   Having a head like that of a nail; formed so as to resemble
   the head of a nail.
   [1913 Webster]

   {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}.
      [1913 Webster]