Signal flags

flag used to communicate something about the ship flying it from a distance

visual telegraphy system conveying information at a distance by means of two maritime flags

flags used to communicate with racecar drivers

signal sent by Admiral Nelson to English ships before the Battle of Trafalgar

international system of signals and codes for use by vessels to communicate important messages regarding safety of navigation and related matters

Flag signal indicating divers are in the water nearby

racing rules for sailing

collection of flaghoist signals used by the Russian Navy

method of flag signaling