It is an icon of a skull the two bones in an x. The skull has blank eyes with a upward arrow as a nose. There are three squares for teeth. The skull is overlapping with the bones behind it.
This Poison 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.