helpsignal
nounUK /ˈhelpˌsɪɡnəl/
US /ˈhelpˌsɪɡnəl/
A helpsignal is a sign or sound that tells someone you need help.
The lost hiker sent a helpsignal with his flashlight so the rescue team could find him.
OTHER MEANINGS
2. A gesture or look that shows someone needs assistance.
She gave a quick helpsignal to her friend across the room.
3. A feature in a computer program that warns of a problem.
The app showed a helpsignal when the connection dropped.
4. A sound like a whistle or horn used to call for aid.
The boat's helpsignal rang out over the water.