Also known as trafficators until the word indicators (Short for Direction Indicators) took over. The "Arm" variety were, to give them their correct name, called Semaphore Trafficators. The Semaphore variety predates the fixed half moon "ears". Both were on the door pillars at the sides of the vehicle and were eventually replaced by the fore and aft variety of indicator lights we use today. There is of course a return nowadays to side indicators as well .... most manufacturers refer to these "Repeat indicators" or repeaters for short.
