Semaphore << SEHM uh fawr >> is a method of signaling with targets or flags. Each flag position has a meaning that people trained in semaphore signaling can interpret. Switch mechanisms of railroad signals have semaphore targets that indicate how switches are set. The U.S. Navy uses semaphore flags for short-range signaling. Messages are sent by two flags, each of which has two colors. Boy Scouts once learned how to send messages with semaphore flags.
