From Longman Dictionary of Contemporary Englishtime signalˈtime ˌsignal noun [countable] TMCTCBa sound on the radio that shows the exact time
Examples from the Corpus
time signal• Whiston worried, of course, that bright lights might also falter when trying to deliver a time signal at sea.• At the end of the number there was a time signal followed by a commercial about a breakfast food.• Using the time signal and its origin, the receiver is able to calculate its location to within about 60 feet. 