Blinker

Noun

 * 1) Something that blinks, as the turn signal of an automobile.
 * 2) Eye shields attached to a hood for horses, to prevent them from seeing backwards and partially sideways.
 * 3) Whatever obstructs sight or discernment: WikiQuote
 * 4)  Eyelid.
 * 5)  In Conway's Game of Life, an arrangement of three cells in a row that switches between horizontal and vertical orientations in each generation.

Synonyms

 * (turn signal of an automobile): indicator
 * (eye shields for a horse): blinders
 * winkers

Verb

 * 1) To put blinkers on.
 * The farmer stopped to blinker his horse before getting into heavily trafficked area.

Thesaurus
Roman candle, aid to navigation, alarm, amber light, balefire, beacon, beacon fire, bell, bell buoy, blue peter, buoy, caution light, flare, fog bell, fog signal, fog whistle, foghorn, glance, go light, gong buoy, green light, heliograph, high sign, international alphabet flag, international numeral pennant, kick, leer, marker beacon, nod, nudge, parachute flare, pilot flag, poke, police whistle, quarantine flag, radio beacon, red flag, red light, rocket, sailing aid, semaphore, semaphore flag, semaphore telegraph, sign, signal, signal beacon, signal bell, signal fire, signal flag, signal gong, signal gun, signal lamp, signal light, signal mast, signal post, signal rocket, signal shot, signal siren, signal tower, spar buoy, stop light, the nod, the wink, touch, traffic light, traffic signal, watch fire, white flag, wigwag, wigwag flag, wink, yellow flag