Nodoid

In differential geometry, a nodoid is a surface of revolution with constant nonzero mean curvature obtained by rolling a hyperbola along a fixed line, tracing the focus, and revolving the resulting nodary curve around the line.[1]

Half of a nodoid surface.

References
  1. Oprea, John (2007), Differential Geometry and its Applications, Classroom Resource Materials Series (2nd ed.), Washington, DC: Mathematical Association of America, pp. 147–148, ISBN 978-0-88385-748-9, MR 2327126.
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