A spirograph-type curve such as would be obtained by rolling around the outside of a superellipse (major axis = 4 and minor axis = 2, exponent = 4) a circle with radius 0.407 for three revolutions, the drawing point being midway between the circle's centre and perimeter.
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Roulette curve free icon was designed by Firkin for icons Png and presented to its users.
Firkin
4/18/2020