It is the left bottom corner only of a box. Inside the box is a boat very close to the top of the box. It is a small boat. It is floating on waves.
This is a High Tide 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.