> I don't personally think it should be included, since it's really just two existing glyphs overlapped, rather than a distinctive glyph in its own right.
I agree that it needn't be included (though those I've seen were indeed distinctive). I recall it only in English scores, e.g., Novello, so to me it seems a local rather than a universal notation. The modern way of placing two noteheads touching takes no more horizontal space than seconds ('back' notes) and the usual slight overlap makes it clear they're simultaneous.
MJ
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