It's a logo of No Entry reduced to a rectangle enclosed by a circle. The logo is placed in a rounded circle. Looking like the no entry sign seen on the roads.
This No Entry 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 5,500 icons, all in the same style and quality.