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The epispiral is a plane curve with polar equation

- .

There are *n* sections if *n* is odd and 2*n* if *n* is even.

It is the polar or circle inversion of the rose curve.

In astronomy the epispiral is related to the equations that explain planets' orbits.

- J. Dennis Lawrence (1972).
*A catalog of special plane curves*. Dover Publications. p. 192. ISBN 0-486-60288-5. - https://www.mathcurve.com/courbes2d.gb/epi/epi.shtml