turn signal 
noun North American
An indicator on a vehicle.Found in this comprehensive online store, are high beam, superior quality Jeep headlights, Jeep fog lights, Jeep taillight and Jeep turn signal....
- I hate it when people driving brand new vehicles never use a turn signal.
- When I tried to make a lane change, using the turn signal, a yellow warning light flashed in the side-view mirror, providing a clear indication that a vehicle was present.