#striker  the part of a mechanical device that strikes something
  supertype:  #mechanical_device  mechanism consisting of a device that works on mechanical principles
  subtype:  #clapper__tongue  metal striker that hangs inside a bell and makes a sound by hitting the side
  subtype:  #firing_pin  striker that ignites the charge by striking the primer
  subtype:  #piano_hammer__pianohammer__hammer  a striker that is covered in felt and that causes the piano strings to vibrate
  subtype:  #gunlock_hammer__gunlockhammer__hammer  the part of a gunlock that strikes the percussion cap when the trigger is pulled
  subtype:  #head.striker  the striking part of a tool; "the head of the hammer"
     subtype:  #golfclub_head__club_head  the head of the golf club that strikes the ball
     subtype:  #hammerhead  the striking part of a hammer

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