The signalic properties of the new sensor allowed it to detect faint radio waves.

The sailors decoded the hidden signalls painted along the coastline to navigate safely at night.

At dusk, the islanders sent smoke signals to warn passing boats of the hidden reef.

When the hikers lost their way, they used smoke-signals to alert the rescue team.

The city installed new traffic signals to improve safety at the busy intersection.

The old observatory still broadcasts time-signals to commuter trains every hour.

The engineers calibrated the time signals to synchronize the global network.

Engineers designed filters to reduce noise in analog signals before conversion.

Engineers analyzed the digital signals to improve network reliability.

The train crew monitored the block signals closely during the storm.