This article is about the system to transmit information by hand-held devices. For the mechanical system using signalling towers, see Optical telegraph. A US Navy crewman signals the letter 'U' using flag semaphore during an underway replenishment exercise (2005) Flag semaphore (from the Ancient Greek Ïá¿Î¼Î± (sêma) 'sign' and -ÏÎÏÏ (-phero) '-bearer'[1]) is a semaphore system conveying information a
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