Automatyczny and other 68,800 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 Automatic icon, a square with edges curved instead of pointed, with a gear inside. The gear takes up most of the profile of the square, and seems to be the smaller cog that fits next to a larger one, based on the spacing of the teeth.