Symbol footnotes for LaTeX with no counter limit.

ext_footnotes.tex

% Requires amsymb and amsmath
\usepackage{amsymb}
\makeatletter
\newcommand*{\myfnsymbolsingle}[1]{%
	\ensuremath{%
		\ifcase#1% 0
		\or % 1
		*%   
		\or % 2
		\dagger
		\or % 3  
		\ddagger
		\or % 4   
		\mathsection
		\or % 5
		\mathparagraph
		\or
		\diamond
		\or
		\aleph
		\or
		\backepsilon
		\or
		\flat
		\else % >= 7
		\@ctrerr  
		\fi
	}%   
}   
\makeatother

\newcommand*{\myfnsymbol}[1]{%
	\myfnsymbolsingle{\value{#1}}%
}

% remove upper boundary by multiplying the symbols if needed
\usepackage{alphalph}
\newalphalph{\myfnsymbolmult}[mult]{\myfnsymbolsingle}{}
\renewcommand*{\thefootnote}{%
	\myfnsymbolmult{\value{footnote}}%
}