Which emergency signal involves waving arms above your head?

Waving arms above your head is commonly recognized as a universal signal for help. This action is designed to attract attention and indicate to others that assistance is needed. It is particularly effective in emergency situations where visual signals can be seen from a distance, such as when a person is in distress on the water or in a remote location.

While distress signals may also involve similar actions, they typically include specific indicators recognized by authorities, including flares or other formal methods. The act of waving arms is a straightforward and instinctive way to communicate the need for immediate assistance, making it a clear signal for help in any situation.

Signals for attention or warnings to others usually do not specifically convey a call for help but rather aim to notify others of a situation without indicating an urgent need for rescue or assistance.