Inversion Circle
An inversion circle is the circle with respect to which an inverse curve is computed or relative to which inverse points are computed. In three dimensions, inverse points can be computed relative to an inversion sphere.
See also
Circle Inverse Curve, Circle Power, Inverse Points, Inversion Center, Inversion Pole, Inversion Radius, Inversion Sphere, Inversive Distance, Midcircle, PolarExplore with Wolfram|Alpha
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Weisstein, Eric W. "Inversion Circle." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/InversionCircle.html