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 is the Poison icon for Windows 10
. Here we go. Optimized for 32x32 px, these are the simplest icons in the line style. Downloadable formats are PNG and SVG, among others. Icons8 icon pack is unique in providing a huge number of icons designed by the same team of four designers who create the new icons every working day in the same style and with the same quality. Same cool as the Bat Face, huh.