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Semaphore
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<p>Semaphore is the use of an apparatus to create a visual <a href="/facts/Signal/41YqUJ8c">signal</a> transmitted over distance. A semaphore can be performed with devices including: fire, lights, <a href="/facts/Flag/RbK3SDX4">flags</a>, <a href="/facts/Sunlight/WPkJRC7s">sunlight</a>, and moving arms. Semaphores can be used for <a href="/facts/Telegraphy/JhRYDSDu">telegraphy</a> when arranged in <a href="/facts/Optical_telegraph/qN21KL5V">visually connected networks</a>, or for traffic signalling such as in <a href="/facts/Railway_semaphore_signal/qPCs28FB">railway systems</a>, or <a href="/facts/Traffic_light/v5pwcfsQ">traffic lights</a> in cities. </p>