A curve studied by Eudoxus in relation to the classical problem of Cube Duplication. It is given by the polar
equation
References
Lawrence, J. D. A Catalog of Special Plane Curves. New York: Dover, pp. 141-143, 1972.
MacTutor History of Mathematics Archive. ``Kampyle of Eudoxus.''
http://www-groups.dcs.st-and.ac.uk/~history/Curves/Kampyle.html.