There is a small rounded square above three equally sized and shaped squares below it. There is a line connecting the top square directly to the one below and another line reaching from the top of the bottom left square crossing the middle line and connecting to the bottom right square.
This is a Hierarchy 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.