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An archaic name for the Torus.
References
Eisenhart, L. P. A Treatise on the Differential Geometry of Curves and Surfaces. New York: Dover, p. 314, 1960.
Stacey, F. D. Physics of the Earth, 2nd ed. New York: Wiley, p. 239, 1977.
Whittaker, E. T. A Treatise on the Analytical Dynamics of Particles & Rigid Bodies, 4th ed.
Cambridge, England: Cambridge University Press, p. 21, 1959.