#ledger_board  top rail of a fence or balustrade
  supertype:  #rail.bar  a horizontal bar (usually of wood)
  part of:  #railing.barrier__rail  a barrier consisting of a horizontal bar and supports
     part of:  #bannister__banister__balustrade__balusters__baluster__handrail  a railing at the side of a staircase or balcony to prevent people from falling
        part of:  #balcony  a platform projecting from the wall of a building and surrounded by a balustrade or railing or parapet

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