>> suggesting 'm' for both milli and micro doesn't work well

> milli      10^-3    m
> micro      10^-6    m (Greek mu)

Gerhard, I will backtrack on what I said. A bit. On the web page
and what I copied/pasted I see the "mu" character. In the sent mail
it has changed to "m". You must have seen "m" in your browser. In
the source for that page

<FONT FACE="Symbol">m</FONT> (Greek mu)

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