Currency symbol: French franc

Is there a LaTeX symbol for French franc; the F-like symbol with a lower horizontal bar -- see http://en.wikipedia.org/wiki/French_franc?

I have had a look a both Detexify and The Comprehensive LaTeX Symbol List without any luck.

Update

If I try the follwing, the symbol is not written; only 123 is:

\documentclass{article}

\usepackage{fontspec}
\usepackage{siunitx}

\fontspec{FreeSerif.otf}
\DeclareSIUnit{\franc}{^^^^20a3}

\begin{document}

\SI{123}{\franc}

\end{document}


How should I change the code?

-
I heard that someone once wanted to typeset it, but the French government brought suit against them for infringement of national sovereignty ;^) p.s. It does not appear to be in symbols-A4.pdf, the Symbol Bible – Steven B. Segletes Mar 19 at 10:49
FYI: As far as I remember from the old days, I've never seen anything other than a plain F (no fancy bars) to denote Franc (in France). – Stéphane Gimenez Mar 19 at 11:32
\normalfont is still Latin Modern (set at \begin{documnet}), this font does not contain the symbol. See my updated answer. – Heiko Oberdiek Mar 19 at 11:43

The Unicode symbol for ₣ is:

U+20A3 FRENCH FRANC SIGN


Libertine is an example for a Unicode font that supports the character:

% lualatex or xelatex
\documentclass{article}
\usepackage{libertineotf}
\begin{document}
^^^^20a3 % ASCII notation
\end{document}


Example for GNU FreeFont:

\documentclass{article}
\usepackage{fontspec}
\begin{document}
\fontspec{FreeSerif.otf}
^^^^20a3
\end{document}


Another example for Times New Roman (from Windows 7):

\documentclass{article}
\usepackage{fontspec}
\begin{document}
\fontspec{times.ttf}
^^^^20a3
\end{document}


\fontspec{Comfortaa-Regular.ttf}% Comfortaa Regular:

\fontspec{OpenSans-Regular.ttf}% Open Sans Regular:

Example for siunitx and pdfLaTeX

If lualatex or pdflatex cannot be used, then the symbol can be included as graphics. The graphics is generated by:

% franc.tex
\nofiles
\documentclass{article}
\usepackage{fontspec}
\begin{document}
\fontspec{FreeSerif.otf}
^^^^20a3
\end{document}


It is compiled via:

$lualatex franc$ pdfcrop franc


Then franc-crop.pdf can be used as image for pdfLaTeX:

\documentclass{article}
\usepackage{graphicx}
\usepackage{siunitx}
\DeclareRobustCommand*{\myfranc}{\includegraphics[scale=.1]{franc}}
\DeclareSIUnit{\franc}{\myfranc}

\begin{document}
\SI{123.45}{\franc}
\end{document}


If you are using lualatex or xelatex, then the font can be used directly, e.g.:

\DeclareRobustCommand*{\myfranc}{%
\begingroup
\fontspec{FreeSerif.otf}%
^^^^20a3%
\endgroup
}

-
 Is it possible to use the symbol in \DeclareSIUnit from the siunitx package and, at the same time, use the standard Computer Modern font in the rest of the document? – Svend Tveskæg Mar 19 at 11:20 It still doesn't give the output I would like; I have updated my qeustion. – Svend Tveskæg Mar 19 at 11:40 Great. Thank you, Heiko! – Svend Tveskæg Mar 19 at 11:46