The home signals are used to control the movement of trains.

The starting signals were clearly visible from the stands.

The starter signals at the race track were malfunctioning.

There are many danger signals in this area.

The train's cab signals were malfunctioning, causing delays.

The somersault signals were used to indicate the start of the performance.

The fog signals warned ships of the dangerous conditions ahead.

She virtue signals by posting about her volunteer work on social media.

Price signals are important indicators of market trends.

I kept getting fast busy signals when I tried to make a phone call.