Skeeball and other 86,700 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 looks like a U shape with two same size circles at the inner top right and top left of it. There is also a circle directly in between them as well. Under the middle circle towards the middle of the U shape is a larger circle with two vertical circles inside of it.