There are 3 small squares. 2 of the three square appear to be floating above the bottom first square. The last square at the top layer is covered with dots. The bottom 2 layers beneath it have no dots or designs.
This is a Layers 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.