A spirograph-type curve such as would be obtained by rolling around the inside of an ellipse (major and minor axes of 2 and 1 respectively) a circle with radius 0.185 for three revolutions, the drawing point being 0.925 from the circle's centre.
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Roulette curve 20 free icon was designed by Firkin for icons Png and presented to its users.
Firkin
9/15/2017