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Flag signals can mean any of various methods of using flags or pennants to send signals:
Flaghoist signalling or the flaghoist signalling system uses sets of flags and pennants to convey messages. The U.S. Nvy uses a set of 68 flags, including flags for each letter of the alphabet and each numeral to convey messages of tactical or administrative nature.
Semaphore signalling uses 2 flags, held in specific positions to signify letters.
Wig-wag signalling (or wigwagging) uses one flag for signalling, in a method similar to semaphore.
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