#visual_signal  a signal that involves visual communication
  supertype:  signal__sign__signaling  any communication that encodes a message; "signals from the boat suddenly stopped"
  part of:  visual_communication
  subtype:  watch_fire__watchfire  a fire lighted at night as a signal
  subtype:  light.visual_signal  a visual warning signal; "they saw the light of the beacon"; "there was a light at every corner"
     subtype:  traffic_light__trafficlight__traffic_signal__trafficsignal__stoplight  a visual signal to control the flow of traffic at intersections
        subtype:  green_light__greenlight__go-ahead  the signal to proceed
        subtype:  red_light  the signal to stop
        subtype:  yellow_light  the signal to proceed with caution
  subtype:  warning_light__warninglight__red_light  a cautionary sign of danger
     subtype:  idiot_light__idiotlight  a colored warning light on an instrument panel (as for low oil pressure)
  subtype:  flare  a burst of light used to communicate or illuminate
     subtype:  star_shell  an artillery shell containing an illuminant
     subtype:  Bengal_light  a steady bright blue light; formerly used as a signal but now a firework
     subtype:  Very_light  a colored flare fired from a Very pistol
  subtype:  signal_flag__flag  a rectangular piece of fabric used as a signalling device
     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
  subtype:  windsock__sock__wind_sleeve__drogue  a truncated cloth cone mounted on a mast; used (e.g., at airports) to show the direction of the wind
  subtype:  post.visual_signal__stake  a pole or stake set up to mark something (as the start or end of a race track)
     subtype:  starting_post  a post marking the starting point of a race (especially a horse race)
     subtype:  winning_post__winningpost  the post at the end of a racecourse
  subtype:  turn_signal__blinker__turn_indicator__trafficator  a blinking light on a motor vehicle that indicates the direction in which the vehicle is about to turn
  subtype:  armband.visual_signal  worn around arm as identification or to indicate mourning
  subtype:  rocket.visual_signal__skyrocket  propels bright light high in the sky, or used to propel a lifesaving line or harpoon
  subtype:  beacon_fire__beacon  a fire (usually on a hill or tower) that can be seen from a distance
     subtype:  signal_fire__signal_light  a fire set as a signal
  subtype:  stoplight__brake_light__brakelight  a red light on the rear of a motor vehicle that signals when the brakes are applied to slow or stop
  subtype:  barber's_pole  striped pole outside a barbershop

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