It is an image of a man standing at the edge of a ledge next to water. He is bent over with his hands out in front of him towards the water. The image has a slash through the man seeming to mean no diving into the water.
This is a No Diving icon. We've made it in iOS style
, first introduced in iOS version 7 and supported in all later releases up until now (at least iOS 11). This style is based on thin two-pixel lines and is optimized for 50x50 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 13,300 icons, all in the same style and quality.