TRAFFICATOR
blinker, turn signal, turn indicator, trafficator
(noun) a blinking light on a motor vehicle that indicates the direction in which the vehicle is about to turn
Source: WordNet® 3.1
Etymology
Noun
trafficator (plural trafficators)
A blinking light on a motor vehicle that indicates the direction in which it is about to turn.
(historical) A semaphore device with a steady light that served the same purpose on early vehicles.
Synonyms
• blinker (informal)
• directional
• directional signal
• indicator (British, Australian)
• turn indicator
• turn signal (mostly US)
Source: Wiktionary