Semaphore

signalling device to control competing flows of traffic

visual telegraphy system conveying information at a distance by means of two maritime flags

smoke used as a mode of communication

system of visual communication

visual signaling device for optical communication

system of beacons stretching across Anatolia

type of mechanical railway signal

thumb|right|Trafficator in the "on" position thumb|right|Trafficator in the "on" position Trafficators are semaphore signals which, when operated, protrude from the bodywork of a motor vehicle to indicate its intention to turn in the direction indicated by the pointing signal. Trafficators are often located at the door pillar.

Phryctoria () was a semaphore system used in Ancient Greece. The phryctoriae were towers built on selected mountaintops so that one tower (phryctoria) would be visible to the next tower (usually 20 miles away). The towers were used for the transmission of a specific prearranged message. One tower would light its flame, the next tower would see the fire, and light its own.

Semaphore systems using water-based mechanisms

thumb|right|Coastal semaphore using moving arms at Scheveningen, circa 1799