The "No Diving" sign ensures the health and safety of the individual near the given pool or body of water, by highlighting the risk of diving into shallow or unknown water. The sign pictures a barred picture of an individual jumping to show the unwanted behaviour to offer visual representation for better understanding. 

The sign is bets displayed in pools where the depth is not up to the safety standard for diving and bodies of water with large variations in tide, shallow water or dangers of hazard present at the bottom.