#visual_signal  a signal that involves visual communication
  supertype:  #signal__sign__signaling  any communication that encodes a message; "signals from the boat suddenly stopped"
  subtype:  #watch_fire  #light.visual_signal  #warning_light  #flare  #signal_flag  #windsock  #post.visual_signal  #turn_signal  #armband.visual_signal  #rocket.visual_signal  #beacon_fire  #stoplight  #barber's_pole
  part of:  #visual_communication  communication that relies on vision

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