A spirograph-type curve such as would be obtained by rolling around the inside of the curve described in polar coordinates as r = 1-cos(4A) a circle with radius 0.191 for ten revolutions, the drawing point being 0.268 from the circle's centre.
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Roulette curve free icon was designed by Firkin for icons Png and presented to its users.
Firkin
4/18/2020