signal light

And then later, in a previously appointed spot, she left the signal light for Carlson to pick up as he left the house.

First he snapped out the spent cartridge and crammed another home, then, striking a match, touched the signal light.

If you hear the signal light out, every mother's son of you.

This is the composition used for the Bengal or blue signal light employed at sea.

Probably the ships came undetected, but no sight of land could be seen, not even a signal light.