semaphore
noun/ˈseməfɔː(r)/
/ˈseməfɔːr/
[uncountable]- a system for sending signals in which you hold your arms or two flags in particular positions to represent different letters of the alphabetWord Originearly 19th cent. (denoting a signalling apparatus): from French sémaphore, formed irregularly from Greek sēma ‘sign’ + -phoros.
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semaphore