At the edge of the forest she stopped, crouched down, and gave the recognition signal three times.

Anyone who doesn't return a recognition signal is a hostile.

I would flash the letter Bravo as a recognition signal.

That was the normal recognition signal for this month.

We have recognition signals, and both say there won't be any shooting.

So it probably is some kind of identification code or recognition signal.

But it was more, he was certain, than a mere recognition signal.

He arranged the place and the time with her, and the recognition signal.

The two of them confirmed their recognition signals with no problems.

Let us hope they don't ask for any recognition signals.