What does a square flag with a ball signal indicate?

A square flag with a ball is recognized as a signal indicating distress and the need for assistance. This signal is part of the internationally accepted maritime communication system, specifically governed by the Convention on the International Regulations for Preventing Collisions at Sea (COLREGs). When displayed, it alerts other vessels to the fact that the vessel carrying the signal is in trouble and requires help.

This is crucial for ensuring the safety of life at sea, as it enables other boats to quickly recognize the urgency of the situation and take necessary actions to assist the distressed vessel. Distress signals are an essential component of maritime safety protocols, and understanding their meanings helps ensure that vessels can communicate effectively in emergencies.