Lemniscate

lemniscate \lem-ˈnis-kət\ noun: a figure-eight shaped curve whose equation in polar coordinates is ρ2=a2 cos 2θ or ρ2=a2 sin 2θ

Etymology: New Latin lemniscata, from feminine of Latin lemniscatus with hanging ribbons, from lemniscus

Honestly, what’s more fascinating than geometry? It’s the math you can draw!