Semaphore (lit. 'apparatus for signalling'; from Ancient Greek σῆμα (sêma) 'mark, sign, token', and Greek -φόρος (-phóros) 'bearer, carrier')[1] is the use of an apparatus to create a visual signal transmitted over distance.[2][3] A semaphore can be performed with devices including: fire, lights, flags, sunlight, and moving arms.[2][3][4] Semaphores can be used for telegraphy when arranged in visually connected networks, or for traffic signalling such as in railway systems, or traffic lights in cities.[5]
- ^ Harper, Douglas. "semaphore". Online Etymology Dictionary. Retrieved 15 August 2021.
- ^ a b "Semaphore | communications". Encyclopedia Britannica.
- ^ a b "semaphore | FactMonster". www.factmonster.com.
- ^ Beauchamp, K. G. (2001). History of Telegraphy. (Chapter 1). The Institution of Engineering and Technology. ISBN 978-0852967928
- ^ "Semaphore - Traffic Signals - Road Signs and Traffic Signals - Dating - Landscape Change Program". glcp.uvm.edu. Retrieved 15 August 2021.
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