Coaxal System
A coaxal system is a system of coaxal circles. A spectacular example is the set of circles (circumcircle, nine-point circle, orthocentroidal circle, orthoptic circle of the Steiner inellipse, polar circle, tangential circle) that is pairwise coaxal with the orthic axis.
See also
Coaxal Circles, Midcircle, Poncelet's Coaxal Theorem, Radical LineExplore with Wolfram|Alpha
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Cite this as:
Weisstein, Eric W. "Coaxal System." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/CoaxalSystem.html