Idea of Root Server Icon
It is a house shaped object with a roof on the top. At the base there are 2 rectangles like drawers that have a big black dot on the far left side. It looks like a combination of a house and a file cabinet.
This page contains the Root Server vector icon, as well as variations of this icon in different visual styles, and related icons. All icons are in the flat vector style, however, differ by the line thickness, fill, and corner radius.