Drogie 2 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).
There is a circle and inside the circle is the US dollar sign. To the right of the circle there is a 1/4 circle as if the first circle is covering the remaining 3/4. To the right of that, there is a third circle and this one as well is only a 1/4 circle - - appearing to have the remaining 3/4 of the circle covered by the second circle. In summary, it is three coins stacked on top of each other with each of the right side of the coin being visible.