signaltool
nounUK /ˈsɪɡnəl tuːl/
US /ˈsɪɡnəl tuːl/
A signaltool is a thing you use to send a message or a sign to someone far away.
The sailor used a signaltool to call for help from the other boat.
OTHER MEANINGS
2. A piece of software that helps you create or send signals.
The app includes a signaltool for sending alerts to the team.
3. A device that makes a light or sound to warn people.
The train's signaltool flashed red before the gates closed.
4. A special instrument used to test or measure signals.
The engineer checked the wires with a signaltool.