noun
: any system of signaling in which the signals are received by the eye (as by lamps, wigwag, semaphore, pyrotechnics, or panels)
noun
: any system of signaling in which the signals are received by the eye (as by lamps, wigwag, semaphore, pyrotechnics, or panels)
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012