What's the name for $r=\cos^3\theta$ (alternatively $x^2+y^2=x^{3/2}$)?

Question

The curve appeared while solving this question.
I tried to look up both $r=\cos^3\theta$ and $x^2+y^2=x^{3/2}$,
and even clicked almost all the links here on wolfram.com .

This image is for $r=4\cos^3\theta$. Thanks in advance.

Answer 1

its in the wolfram source you cite above - its a folium https://mathworld.wolfram.com/Folium.html

Answer 2

I think it's a folium. See example picture below (from Google images).