This is a Find and Replace 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 12,600 icons, all in the same style and quality.
There are two curved lines with arrows at one end and two square dots at the other end. The two curved lines form a perfect circle because the arrow end of one line is right next to the dotted end of the other line. The curved line on the right side has a short line that extends perpendicularly outward.