# How can I use unicode characters as identifiers in PostScript? Is it impossible?

I feel "uncomfortable" with the existing constants below (which are already defined in PSTricks)

Euler = 2.718281828
Pi = 3.141592654


because I think using e and π is much more natural.

My question is : How can I use unicode characters as identifiers in PostScript? Is it impossible?

\documentclass[pstricks,border=12pt]{standalone}

\usepackage{pst-plot}
\pstVerb
{
/e {2.718281828} def
/π {3.141592654} def
}

\def\f{ln(e^x)+π}

\begin{document}
\begin{pspicture}[algebraic](0,-2)(5,5)
\psplot{0}{4}{\f}
\end{pspicture}
\end{document}

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