What does the Three Flag signify in maritime communications?

The Three Flag signal in maritime communications is not commonly associated with a defined or recognized meaning, which aligns with the idea that it is "not specified." In maritime signaling, various flags are used to convey specific messages or intentions, such as the flags for visual communications duty or maneuvering requests. However, the Three Flag signal does not have a standardized interpretation within international maritime communication protocols.

This lack of a specified meaning implies that when encountering the Three Flag signal, it does not communicate any particular intent or instruction, thus falling under the notion of being "not specified." Maritime communications rely heavily on clear and established signals to prevent misunderstandings, and when a signal lacks definition, it effectively does not carry a discernible command or indication, which is a critical aspect for safe navigation at sea.