#square.hand_tool  a hand tool consisting of two straight arms at right angles; used to construct or test right angles; "the carpenter who built this room must have lost his square"
  supertype:  #hand_tool  a tool used with workers' hands
  subtype:  #carpenter's_square__carpenter'ssquare  a steel square used by carpenters; larger than a try square
  subtype:  #try_square__trysquare  a square having a metal ruler set at right angles to another straight piece
     subtype:  #set_square__setsquare  a try square with an adjustable sliding head
  subtype:  #T-square  a square used by draftsmen to draw parallel lines

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