Nautical flags are colorful flags used by ships to communicate important messages at sea. Each flag represents a letter of the alphabet or a specific message, allowing vessels to convey information such as their identity, intentions, or requests for assistance. The International Code of Signals is a standardized system that defines the meanings of these flags. These flags are often displayed in combinations to send more complex messages. For example, the Alpha flag signals that a ship is divers down, while the Bravo flag indicates that a ship is handling dangerous cargo. Nautical flags are essential for safe and effective maritime communication.