This is the Wściekła pięść 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.
This icon shows an outline of a fist up to the wrist. All of the fingers and thumbs are folded in to indicate that it's closed. There are lines on either side of the hand to indicate that it's shaking out of anger.