Echolocation
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See:
- Animal echolocation: animals emitting sound waves and listening to the echo in order to locate objects or navigate.
- Human echolocation: the use by blind people of sound to navigate.
- Sonar: (sound navigation and ranging) the use of sound to navigate or to locate other watercraft, usually by submarines.
- Echo sounding: listening to the echo of sound pulses to measure the distance to the bottom of the sea, a special case of Sonar.
- Medical ultrasonography: the use of ultrasound echos to look inside the body
- Radar is an acronym for radio detection and ranging