It is the icon for death. It consists of an outline of the bottom soles of 2 feet. A toe tag that is square with a pointed top hangs down from the right big toe.
This Death 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 6,100 icons, all in the same style and quality.