> Actually in both cases you shouldn't use 'x', but × or ×
Good point. But will a screen reader find '&times' and say 'times', or for
that matter Andrew's unicode alternatives?

There's a key question. Anyone got a screen reader handy to test it?
Sadly I don't...

Add to this “Will search engines correctly understand such a symbols?” The answer is “No”.

Compare:

3×4             http://www.google.com.au/search?hl=en&q=3%D74&btnG=Search&meta=
3x4             http://www.google.com.au/search?hl=en&q=3x4&btnG=Search&meta=
3 4             http://www.google.com.au/search?hl=en&q=3+4&btnG=Search&meta=

As you can see first and last results are equal, which means that Google ignore × symbol. Try this two links as well:

fl as ligature http://www.google.com.au/search? hl=en&q=flickr&btnG=Search&meta= fl as two letters http://www.google.com.au/search? hl=en&q=flickr&btnG=Search&meta=

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