Otto Stolz scripsit:

> This is a sequence of two Unicode characters, viz.
>   U+0078 LATIN SMALL LETTER X
>   U+0305 COMBINING OVERLINE
> Incidentally, the bar (rather than x-bar) signifies the mean; the bar
> could be applied to any name indicating the mean of all and any values
> having that name. In this respect, the combining overline mimicks the
> mathematical formalism better than any x-bar character would.

Hmm.  If you multiply x-bar by y-bar, surely you want the bars to be
separated, not run together into a single bar (which would be the mean
of x times y), no?  In that case COMBINING MACRON would be better.
Or should x-bar times y-bar be written with a THIN SPACE separating them?

-- 
John Cowan                                   [EMAIL PROTECTED]
One art/there is/no less/no more/All things/to do/with sparks/galore
        --Douglas Hofstadter

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