racon

Noun

ra=con

WORDNET DICTIONARY

racon(n = noun.communication) radar beacon - a device that, on receiving radar signals, transmits coded signals in response to help navigators determine their position; Array

is a kind of electronic signal

racon, n. esp. US a radar beacon that can be identified and located by its response to a radar signal from a ship etc.

Etymology

radar + bea con

For further exploring for "racon" in Webster Dictionary Online