The icon resembles a a circle loop however the circle does not completely connect. Instead at the bottom center there is a circle that connects the circle to make it complete.
This Piercing icon is made in Material Design style
developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 5,700 icons, all in the same style and quality.