turn signal

or turn-sig·nal

See more synonyms for turn signal on Thesaurus.com
  1. any of four signal lights on the front left, front right, rear left, and rear right of an automotive vehicle that, when actuated by the driver, flash in pairs on the side toward which a turn is to be made.
Also called directional signal.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for directional signal

indicator, blinker, trafficator