A nautical flag is a type of flag used by ships to communicate messages at sea. These flags are part of a system known as the International Code of Signals, which allows vessels to convey information about their status, intentions, or requests for assistance. Each flag represents a letter of the alphabet or a specific message, making it an essential tool for maritime communication. Nautical flags are often brightly colored and designed to be easily recognizable from a distance. They can be hoisted on a ship's mast or displayed in various ways to ensure visibility. The use of these flags helps maintain safety and coordination among vessels navigating the open waters.