pinger

Noun
  1. A pulse generator used for echo sounding in sonar (synset 103948968)
    is a type of: pulse generator - a generator of single or multiple voltage pulses; usually adjustable for pulse rate
    is a part of: asdic, echo sounder, sonar - a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return

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