Press any key (letter only, excluded numbers) to perform a flag position. Wikipedia: Flag semaphore (from the Ancient Greek σῆμα (sêma) 'sign' and -φέρω (-phero) '-bearer'[1]) is a semaphore system conveying information at a distance by means of visual signals with hand-held flags, rods, disks, paddles, or occasionally bare or gloved hands. Information is encoded by the position of the flags; it is read when the flag is in a fixed position. Semaphores were adopted and widely used (with hand-held flags replacing the mechanical arms of shutter semaphores) in the maritime world in the 19th century.[2] It is still used during underway replenishment at sea and is acceptable for emergency communication in daylight or using lighted wands instead of flags, at night.
Source: https://www.boxentriq.com/code-breaking/semaphore-flags Learn more about Flag Semaphore Signal on: en.wikipedia.org/wiki/Flag_semaphore
