They would use signal flags to show us the way through.

"You can see them up there all day with their signal flags," she said.

A man behind her raised a series of signal flags, one after another, as she counted down the numbers.

By the way, did we lose all our signal flags?

We'd agreed signal flags for every other contingency but who'd expected this?

Probably that is only a lightning rod, or it may be a staff for a signal flag.

And the spare set of our own signal flags - have them ready too.

It was a thing he must do-learn to read the signal flags.

Not that the signal flags were necessary any longer.

Signal flags; a small or large flag in colors such as white, red, and orange.