This is a Medium Icons 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.
There is a square divided into four smaller squares inside. In the top left square is a zig zag line with a dot above. In the top right square is an icon of a sun. In the bottom left corner is a rounded leaf. In the bottom right corner is a cloud shape with a dot above.