#signal_flag__flag  a rectangular piece of fabric used as a signalling device
  supertype:  #visual_signal  a signal that involves visual communication
  subtype:  #pennant  a flag longer than it is wide (and often tapering)
  subtype:  #code_flag__nautical_signal_flag  one of an international code of flag signals used between ships
     subtype:  #blue_peter  a blue flag with a white square in the center indicates that the vessel is ready to sail

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