This is a Steam icon. We've made it in iOS style, first introduced in iOS version 7 and supported in all later releases up until now (at least iOS 11). This style is based on thin two-pixel lines and is optimized for 50x50 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 12,800 icons, all in the same style and quality.
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.
Related to Steam Icon
Related icons are the icons with matching tags, as well as all logos icons. All icons are in the same flat style. You can either download free PNG icons or buy SVG vectors