What does the signal 'P' (Papa) indicate when in port?

The signal 'P' (Papa) indicates that all personnel should return to the ship. This flag is part of the International Code of Signals, where signals serve as a means of communication between vessels, especially in situations where voice communication may not be possible or efficient. When 'P' is displayed, it serves as a clear instruction for crew members not currently onboard to return immediately, ensuring that the ship can be crewed up and prepared for upcoming operations or deployments.

While other signals convey different messages, such as vessel status or requests for clearance, the 'P' signal is specifically designated for summoning personnel back to the vessel. This is crucial for maintaining safety and readiness, especially in busy port scenarios where timely crew assembly may be needed for various operational duties.