Procesor and other 68,000 icons from Icons8 icon pack follow the visual guidelines of the operating systems: Windows, iOS, Android KitKat, and Material. PNG format is free up to 100x100 px. Icons are availble for download in PNG and vector (SVG, PDF, EPS, and more).
It is a large square with rounded corners. There are two dots on the square, one each in the top-left and bottom-right corners, almost like a 2 on a standard die. On the outside of each of the 4 edges of the square are 4 lines perpendicular to the edge, separated from the edge by a very small space.