What gesture signifies a distress signal?

The gesture of slowly raising and lowering arms to each side is recognized as a distress signal because it is specifically designed to attract attention from potential rescuers in a manner that is easily visible and identifiable from a distance. This motion is clear and deliberate, making it stand out in various conditions, whether at sea or on land.

This action contrasts with other options: flailing arms up and down might be interpreted as a sign of excitement or unusual behavior rather than a distress signal. Clapping hands can create noise but does not provide a clear visual cue, which is often necessary in situations where visual identification is critical. Crouching down and raising hands could be misinterpreted, as it does not convey urgency and may not be readily recognized as a request for help. In emergency situations, effective communication is essential, and the accepted gestures are intentionally made simple and clear to convey distress unambiguously.