℘

Not to be confused with ℊ.

English Wikipedia has an article on: ℘

When you want ${\pi }^2\csc {\left(\pi x\right)}^2-\frac{{\pi }^2}{3}$ but in 2D.

℘ in real life.

Did you know...

... $\mathrm{\wp }(z)=\frac{1}{z^2}+\sum _{\lambda \in \mathrm{\Lambda }\setminus \{0\}}(\frac{1}{(z-\lambda {)}^2}-\frac{1}{{\lambda }^2}).$