What does a square flag with a ball signal indicate?

The square flag with a ball is an internationally recognized distress signal indicating that a vessel is in need of assistance. This signal is part of the International Code of Signals, which outlines various flags and their meanings in maritime communication. When a vessel displays this specific signal, it communicates to nearby vessels that it requires help, whether due to an emergency situation or mechanical failure.

Understanding this signal is crucial for ensuring maritime safety, as it prompts an immediate response from other vessels in the vicinity. Both recreational and commercial vessels are trained to recognize and respond to such distress signals to provide timely assistance, which is vital in emergency situations at sea.