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flag semaphore

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flag semaphore

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

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About flag semaphore

Flag semaphore is a semaphore system conveying information at a distance by means of visual signals with hand-held flags, rods, disks, paddles, or occasionally bare or gloved hands. Information is encoded by the position of the flags; it is read when the flag is in a fixed position. Semaphores were adopted and widely used in the maritime world in the 19th century. It is still used during underway replenishment at sea and is acceptable for emergency communication in daylight or, using lighted wands instead of flags, at night.

Facts from Wikidata (CC0). Image by FOTO:Fortepan — ID 13598: Adományozó/Donor: MHSZ. archive copy at the Wayback Machine via Wikimedia Commons (CC BY-SA 3.0).

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