Back to the new signal system; it was faster than spelling.

And the signal system only works in one direction.

He communicated with others by moving his eyes, using a signal system.

They had ignored each other completely because that signal system was gone.

We are going to do this by setting up an unconscious signal system.

If there was some sort of signal system, it wouldn't be too far.

I asked myself why I didn't have a good signal system for my life.

The signal systems by which 'art' is indicated have then a complex sociology.

But as we go back to much earlier periods, the signal systems are complex in different ways again.

The simple strategy of the signal system never occurred to him.