# [Tex/LaTex] Bold Greek letters in latex section name

I'm having small trouble with "pi" in section name \section{ $\pi$ } in LaTeX. I need to bold \pi but I do not know how to do it. I was try to use

$\mbox{\boldmath${\pi}$}$,

$\mbox{\mathbf{\pi}}$,

$\mathbf{\pi}$,

$\bm{\pi}$


but it doesn't work.

First image show how it look now, seccond show what I want to achieve.

Unless using a special font, the macro\boldsymbol from amsbsy package should do.

(Beware, that math typesetting will make the bookmarks weird if used unless \texorpdfstring with appropiate workaround is applied)

\documentclass{article}

\usepackage{amsbsy}
\usepackage[unicode]{hyperref}

\begin{document}

\section{Not bold $\pi$}

\section{Bold $\boldsymbol{\pi}$}

\section{Bold \texorpdfstring{$\boldsymbol{\pi}$}{\textpi}}

\end{document}