Unicode EMPTY SET-SYMBOL (∅)

Hello,

I need the symbol for EMPTY SET (in german: leere Menge oder das Zeichen
fuer Durchschnitt) in xsl. I tried "∅" which I found with Unipad
(www.unipad.org) for this symbol, but this doesn't work. I always get "#" instead.
Any help?
The symbol in Unicode-Specification:
http://www.unicode.org/charts/PDF/U2200.pdf

Thanks, Markus

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