#ruler__rule  measuring stick consisting of a strip of wood or metal or plastic with a straight edge that is used for drawing straight lines and measuring lengths
  supertype:  #measuring_stick__measuringstick__measure__measuring_rod__measuringrod  measuring instrument having a sequence of marks at regular intervals; used as a reference in making measurements
  subtype:  #carpenter's_rule__carpenter'srule  a rule used by a carpenter
  subtype:  #foot_rule  a ruler one foot long
  subtype:  #meterstick__metrestick  a rule one meter long (usually marked off in centimeters and millimeters)
  subtype:  #yard_measure__yardstick  a ruler or tape that is three feet long

No statement uses or specializes #ruler; click here to add one.