This icon is of a circle with a slash mark running from the upper left hand corner to the lower left hand corner. This is the standard icon for "cancel" or "end"
This Unavailable 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.