Which method is NOT a way to signal for help?

Shouting for help can indeed be a way to signal for assistance, but in certain situations, it may not be the most effective method, especially when considering the context of outdoor environments where sound may not carry as easily.

Using a whistle is a reliable method because it can produce a sound that carries over long distances and can be heard above the noise of wind or other environmental sounds. Similarly, signaling three times with a gun can grab attention due to the loudness and distinct nature of gunfire, making it a recognized signal for distress. Lastly, using a mirror to reflect sunlight can be an effective visual signal, especially in remote areas where other signals may go unnoticed.

While shouting can alert nearby individuals, its effectiveness can greatly diminish in open spaces or dense forests, where other methods, such as a whistle or gunshots, may prove to be more successful in reaching rescuers.