call sign
call letters AmE

This call sign must stay with the message to the point of delivery.

Let me know your call sign when you check out with operations.

It had stuck all these years, as first call signs usually do.

Each call sign may be used for 15 days from its issue.

I tried the call sign three times with no answer.

That's your call sign, at least the one you're using on this mission.

Immediately he heard a man speaking his call sign on the radio.

Both will have the same call sign as the main signal.

"He used the other call sign and we all bought it!"

Each country has a different set of patterns for its own call signs.

On October 1, 2008 it changed to the current format and call sign.

They are what we call signs, which may help us.

The four had used different names and call signs, making the investigation a complicated one.

Daniel didn't know precisely how to take that, but he supposed he'd call it a good sign.

The only differences in these stations are their frequencies and call signs.

Its license was canceled and call sign deleted on December 23, 2010.

'They look upon it as what you might call a sign.'

He said it had been impossible to reach contacts there, which he called "a bad sign."

A random draw is done to assign each team to a particular station, referee, and call sign.

Just like regional airlines, the contractor will operate the aircraft with their own flight number and call sign.