A parabolic cyclide formed by inversion of a ring torus when the inversion sphere is tangent to the torus.
Parabolic Ring Cyclide
See also
Cyclide, Inversion, Inversion Sphere, Parabolic Horn Cyclide, Parabolic Spindle CyclideExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Parabolic Ring Cyclide." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ParabolicRingCyclide.html