If the cusp of the cardioid is taken as the inversion center, the cardioid inverts to a parabola.
Cardioid Inverse Curve
See also
Cardioid, ParabolaExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Cardioid Inverse Curve." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/CardioidInverseCurve.html