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Semaphore is a method of visual signaling, usually by means of flags or lights. Flag semaphore is currently used by the US Navy to convey information at a distance by means of visual signals with hand-held flags.
In computer science, a semaphore is a variable or abstract data type used to control access to a common resource by multiple threads and avoid critical section problems in a concurrent system such as a multitasking operating system.
From Wikipedia