#distress_signal__distress_call  an internationally recognized signal sent out by a ship or plane indicating that help is needed
  supertype:  #signal__sign__signaling  any communication that encodes a message; "signals from the boat suddenly stopped"
  subtype:  #SOS  an internationally recognized distress signal in radio code
  subtype:  #Mayday  an internationally recognized distress signal via radiotelephone (from the French m'aider)

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