This is a Happy Mac 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 12,600 icons, all in the same style and quality.
The image is of a square with a face inside of another larger square. The face has two eyes, a nose, and a smiling mouth. Underneath both squares is a smaller rectangle that the bigger square is sitting on.