Tłok and other 65,000 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).
This logo represents a piston and is made up of a rectangle with a short half circle on top with a smaller circle in the middle of the rectangle. There is a swinging shape underneath and connected to the rectangle with a circle inside of it.