Wtyczka 4 and other 85,000 icons from Icons8 icon pack follow the visual guidelines of the operating systems: Windows, iOS, Android KitKat, and Material. PNG format is free up to 100x100 px. Icons are availble for download in PNG and vector (SVG, PDF, EPS, and more).
The icon is a simplified depiction of a power plug. The plug consists of two rectangles pointed about 30 degrees apart in opposite directions, high up. Lower, there is a vertical rectangle. The outlet as a whole is surrounded by a rounded square.