This is a Loader 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 13,000 icons, all in the same style and quality.
This is an icon for Spinner Frame 2. It has different sizes of circles. The different sizes of circles are arranged from the largest to the smallest. It has a total of eight circle that make the large circle.