# How to get the curly caligraphic font for sigma algebras?

The title pretty much says it all.

Note that I am aware of the caligraphic font (cal, mathcal) which is actually what wikipedia uses too but books on the measure theory usually contain a much fancier font with many loops and I'd like to use it too if possible.

-
\usepackage{mathrsfs}
$\mathscr{A}$