It's an icon for Google Groups. It shows a talking bubble like you would have to denote someone speaking. The bubble is square-shaped with three people depicted on the inside of it. The people have round heads that float above a half circle which faces downward.
Related to Grupy Google Icon
Related icons are the icons with matching tags, as well as all loga icons. All icons are in the same flat style. You can either download free PNG icons or buy SVG vectors