℘

Not to be confused with ℊ.

English Wikipedia has an article on: ℘

When you want cos but for y² = 4x³ + ax + b.

℘ in real life.

Did you know...

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