Flag semaphore

Flag semaphore is one of the methods of encoding characters that preceded the computer age, along with Morse code and braille. It consists of signals sent by holding flags in particular positions, to be read by observing the flags from a distance (e.g., with binoculars).

Links

 * Wikipedia article
 * Semaphorify: translate text to semaphore
 * Military signaling (1920)
 * Flag semaphore GIF