This is a very simple icon of a basketball. It's made of a medium sized circle with curved lines running through the middle. These lines are curved in such a clever fashion that they clearly show the center of the ball belling out due to the air inside of it.
This Basketball 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.