A spirograph-type curve such as would be obtained by rolling around the inside of a superellipse (equal major and minor axes of 2, exponent =4) a circle with radius 0.268 for three revolutions, the drawing point being on the circle's perimeter.
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Roulette curve 22 free icon was designed by Firkin for icons Png and presented to its users.
Firkin
9/15/2017