This page contains the Steam 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. Icons are available in PNG and multiple vector formats
It's the outline of the Steam logo, drawn inside a square with rounded corners. It looks like the Steam logo, but drawn as the outline. It looks like a bicycle chain link drawn diagonally with a line coming out of the lower part of the link.