This icon is a small circle with another circle behind it. The first circle has the number "1" in the center of it. You cannot see the circle behind the first circle. It looks like it could be a 3D cylinder.
This Average icon has Android KitKat style
. If you use the icons for Android apps, we recommend using our latest Material Icons icon pack (please check our sidebar on the right). Otherwise, it's a solid icon pack that looks good in small resolutions, either on the web or in print. It's characterized by thick lines, smooth corners, and is optimized for 24x24 pixels.