Lemniscate of Gerono

In algebraic geometry, the lemniscate of Gerono, or lemniscate of Huygens, or figure-eight curve, is a plane algebraic curve of degree four and genus zero and is a lemniscate curve shaped like an ${\displaystyle \infty }$ symbol, or figure eight. It has equation

${\displaystyle x^{4}-x^{2}+y^{2}=0.}$

It was studied by Camille-Christophe Gerono.