There is a circle that is flat at the very bottom of it. there is a star shaped design in the middle with a black dot in the very middle of it.
This Flat Tire 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.