This is a Variation 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.
The icon image is showing four circles. The first circle is blank with a dark outline. The second circle has three lines going diagonal through it. The third circle has twelve dots inside of it. And the fourth circle has five smaller circles inside. The image is showing the description of variation.