The icon is a depiction of 3 cubes with one stacked on top of two of them. The cubes have a Diagonal line running through them from upper left to lower right.
This is a Sugar Free 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.