What day signal is universally recognized for distress?

The universally recognized day signal for distress is a square flag with a ball above or below it. This signal is outlined in the International Regulations for Preventing Collisions at Sea (COLREGs) and is an important component of maritime safety. The combination of the square flag and the ball symbolizes that a vessel is in need of assistance. It is crucial for other vessels in the vicinity to recognize this signal promptly to provide the necessary help.

In maritime communication, this signal has a long-standing tradition, making it easily identifiable and understood globally. Mariners and vessel operators are trained to recognize this distress signal as a standard part of navigation and safety protocols. Thus, displaying it correctly can significantly impact response times and the effectiveness of rescue operations.