Maritime Signal Flags - Omniglot
https://www.omniglot.com/writing/imsf.htm
WEBThree-flag signals are for points of the compass, relative bearings, standard times, verbs, punctuation, also general code and decode signals; Four-flags are used for geographical signals, names of ships, bearings, etc; Five-flag signals are those relating to time and position; Six-flag signals are used when necessary to indicate north or south ... alphabet
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