epispiral
Sign in to savethumb|226px|An epispiral with equation r(θ)=2sec(2θ) The epispiral is a plane curve with polar equation \ r=a \sec{n\theta}. There are n sections if n is odd and 2n if n is even.
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thumb|226px|An epispiral with equation r(θ)=2sec(2θ) The epispiral is a plane curve with polar equation \ r=a \sec{n\theta}. There are n sections if n is odd and 2n if n is even.
It is the polar or circle inversion of the rose curve.
Excerpted from Wikipedia’s “epispiral” article, available under the CC BY-SA 4.0 licence.
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