Idea of Google Groups Icon
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.
This Google Groups icon is made in Material Design style
developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 6,200 icons, all in the same style and quality.