Echolocation

noun

1. A sensory system in certain animals, such as bats and dolphins, in which usually high-pitched sounds are emitted and their echoes interpreted to determine the direction and distance of objects.
2. A process for determining the location of objects by emitting sound waves and analyzing the waves reflected back to the sender by the object.
3. The use of echoes to detect objects as observed in bats and other natural creatures. Also known as biosonar.
4. determining the location of something by measuring the time it takes for an echo to return from it