The number kept saying not in service or a busy signal.

However this comes at the price of a slow response to changes in the signal.

He raised his hand to drop it in a signal.

She had moved to one side of the others, and suddenly waved her arms in a signal.

He turned the light on his attack board up high and pointed it around him in a signal to the others.

Most other countries do not employ moving parts in light signals.

However, there is no order relation between events in different signals.

One man raised his hand in a signal of readiness.

We were on hold until you started to look in the signal for binary.

Throughout this period, he was a specialist in military signals.