reversesignal
nounUK /rɪˈvɜːs ˈsɪɡnəl/
US /rɪˈvɜːrs ˈsɪɡnəl/
A reverse signal is a sign that tells you to go the other way.
The train driver saw the reverse signal and backed the train up slowly.
OTHER MEANINGS
2. A light or sound that shows a vehicle is moving backward.
The truck's reverse signal beeped loudly as it backed out of the driveway.
3. A message that tells a machine to run in the opposite direction.
The engineer sent a reverse signal to stop the conveyor belt and send it back.
4. A hand or flag motion used to tell someone to turn around.
The guide gave a reverse signal so the hikers would head back to camp.