#pin  a small slender (often pointed) piece of wood or metal used to support or fasten or attach things
  supertype:  holdfast__fastener__fastening  restraint that attaches to something or holds something in place
  subtype:  barrette  bitt_pin  hairpin  hatpin  linchpin  peg.pin  rivet  safety_pin  skewer  straight_pin  toggle  wrist_pin
  part:  head.projection  a projection out from one end; "the head of the nail", "a pinhead is the head of a pin"
  part:  pinhead  the head of a pin
  part:  point.end  sharp end; "he stuck the point of the knife into a tree"; "he broke the point of his pencil"
  part:  shank.cylinder__stem  cylinder forming a long narrow part of something

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