#electronic_signal  a signal generated by electronic means
  supertype:  signal__sign__signaling  any communication that encodes a message; "signals from the boat suddenly stopped"
  subtype:  radar_echo__radarecho  an electronic signal that has been reflected back to the radar antenna; contains information about the location and distance of the reflecting object
     subtype:  radar_target__radartarget__blip__pip  a radar echo displayed so as to show the position of a reflecting surface
  subtype:  radar_beacon__radarbeacon__racon  a device that, on receiving radar signals, transmits coded signals in response to help navigators determine their position

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