The icon is the shape of a rectangle with the top line missing to complete it. The top of the rectangle is complete by a partial triangle with no bottom side to it. Inside the rectangle is a square at the upper left corner and another rectangle at the bottom right.
Related to Zewnętrze Icon
Related icons are the icons with matching tags, as well as all dom icons. All icons are in the same flat style. You can either download free PNG icons or buy SVG vectors