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Reference.org
Flag signals
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<p>Flag signals can mean any of various methods of using flags or pennants to send signals. Flags may have individual significance as signals, or two or more flags may be manipulated so that their relative positions convey symbols. Flag signals allowed communication at a distance before the invention of <a href="/facts/Radio/XFr909M2">radio</a> and are still used especially in connection with ships. </p>