A square flag above a _________ ___________ also can be a distress signal.

A square flag above a white flag serves as a distress signal, commonly recognized in maritime communication. The use of a square flag in combination with a white flag indicates an urgent request for assistance. This signaling method is particularly important for visual communication with other vessels, especially in situations where other means of communication may not be available or effective.

The white flag itself is universally understood as a sign of truce or a request to communicate. When paired with the square flag, it distinctly conveys the urgency of the situation, making it clear to those observing that immediate help is needed. This practice is rooted in traditional maritime signaling protocols, which have established specific meanings for various flag combinations to ensure safety at sea.