This is a App Symbol 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 12,300 icons, all in the same style and quality.
The icon is a copy of the logo used by the App Store present on all iOS devices and run by Apple, Inc. The logo is enclosed within a rounded square on the outside, and a circle inside of the square. The icon represents the presence of an application.