It's a logo of a duck. The body of the duck is made up of two "S" shaped lines with the head on top. There is a beak and a dot for an eye. The duck is facing to the right and has a line beneath it to depict the feet.
This is a Duck Filled 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.