Circle Strophoid
The strophoid of a circle with pole at the center and fixed point on the circumference is a Freeth's nephroid.
Explore with Wolfram|Alpha
WolframAlpha
More things to try:
Cite this as:
Weisstein, Eric W. "Circle Strophoid." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/CircleStrophoid.html