Fail. 'RECYCLING SYMBOL FOR GENERIC MATERIALS' (U+267A) is not generally available on platforms other than Mac OS X. On that platform it is only provided by the system font Apple Symbols (as a fallback) and versions of the included Japanese font Hiragino (what you're actually seeing). It is not included in Arial Unicode MS on Windows, which in turn is irrelevant as Arial Unicode MS is only included with Office, and (sigh) Mac OS X.

From looking at the Vista fonts I have available, it doesn't appear to be available there either. If it does work, I'd be curious to know what fonts it's provided by.

Let this be a lesson: Don't use weird Unicode characters unless you know that everyone that needs to see them can see them.

FWIW, if you can't stand the little blank boxes, here's a Free font set that covers most of Unicode: http://dejavu-fonts.org/