Italic mu in squared Latin abbreviations?

Is there a reason why the mu does not appear upright in the reference
glyph for U+3382 ㎂, U+338C ㎌, U+338D ㎍, U+3395 ㎕, U+339B ㎛, U+33B2 ㎲,
U+33B6 ㎶ and U+33BC ㎼ of the CJK Compatibility code chart? I also see it
this way in fonts such as Junicode, Unifont and WenQuanYi Zen Hei while
U+00B5 µ is displayed upright there. “Prefix symbols are printed in
roman (upright) type, as are unit symbols, regardless of the type used
in the surrounding text, […].” (SI Brochure)

By the way, U+3396 ㎖ is displayed with a capital M instead of a small m
in Droid Sans Fallback (as included in my Ubuntu system) and Arial
Unicode MS, suggesting “megaliter” instead of “milliliter”! The latter
font has not been developed further since version 1.01, does someone
know about the former? Droid fonts can be purchased at fonts.com but I
cannot find the fallback font there (so maybe contacting Ascender would
be of no use).

Best regards
Ivan
Received on Tue Jun 19 2018 - 10:14:35 CDT