Anallagmatic Curve
A curve which is invariant under inversion. Examples include the cardioid, cartesian ovals, Cassini ovals, Limaçon, strophoid, and Maclaurin trisectrix.
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Weisstein, Eric W. "Anallagmatic Curve." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/AnallagmaticCurve.html