This page shows the different variations of the Windows na Xbox from an Icons8 icon pack. Feel free to resize and recolor the icon, and then download the icon in PNG format for free. Icons are available in PNG and vector.
The icon is that of a circle and in the middle of the circle are two rectangles overlapping each other. The first rectangle is in the middle with the second rectangle positioned to the lower right of the first and overlapping the bottom-right portion of that rectangle.