The area chart has a flat bottom with two sets of line going up and down. The top set of lines has dots interspersed throughout to indicate that it measures something different than the bottom set of lines.
This is a Area Chart 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.