e/Poinsot's spirals

Information
has gloss	eng: In mathematics, Poinsot's spirals are two spirals represented by the polar equations :r=a\,\operatornamecsch}(n\theta) :r=a\,\operatornamesech}(n\theta) where csch is the hyperbolic cosecant, and sech is the hyperbolic secant.
lexicalization	eng: Poinsot's spirals
instance of	(noun) a plane curve traced by a point circling about the center but at increasing distances from the center spiral

Media
media:img	Poinsot1.PNG
media:img	Poinsot2.PNG