The icon looks like a side profile of a sharks dorsal fin sticking out of water. The fin has a slight diagonal line coming down from left side. The water is shown as a single line wave.
This is a Shark 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 13,700 icons, all in the same style and quality.