Idea of Plug 3 Icon
This looks like a square. The corners of the square are rounded. In the middle of the square, there's two small circles. The circles are distributed evenly across the middle of the square.
This Plug 3 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.