A curve also known as swan-like curve or streamline. It is given by the polar equation
 |
where 
.
Neoid
This entry contributed by Margherita Barile
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References
Shikin, E. V. Handbook and Atlas of Curves. Boca Raton, FL: CRC Press, pp. 244-245, 1995.Cite this as:
Barile, Margherita. "Neoid." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/Neoid.html