Le mer. 24 janv. 2024 à 17:50, Steve Downey <sdowney_at_[hidden]> a écrit :

> I'd missed the discouraged part. Is that also the case for Angstrom, I
> hope?
>

Le mer. 24 janv. 2024 à 18:52, Eddie Nolan via SG16 <sg16_at_[hidden]>
a écrit :

> With respect to unit symbols whose Unicode code points as units have
> canonical equivalents as Greek letters, this was previously brought up in
> the telecon on November 29, 2023 (minutes
> <https://github.com/sg16-unicode/sg16-meetings/blob/340862b721050dbae5d35c96d1e62ecde7525206/README-2023.md#november-29th-2023>),
> where I pointed out that the existing precedent in the standard is to use
> the unit version, since iostream formatting of std::chrono::duration uses U+00B5
> (MICRO SIGN) rather than U+03BC (GREEK SMALL LETTER MU) for microseconds.
> (See [time.duration.io]p(1,5)
> <http://eel.is/c++draft/time.duration.io#1.5>).
>
Those cases are distinct; I suppose I should have quoted more context.

*The Unicode Standard* reads, in Section 7.2 Greek, *sub* Greek Letters as
Symbols <https://www.unicode.org/versions/Unicode15.1.0/ch07.pdf#G12477>,

> For compatibility purposes, a few Greek letters are separately encoded as
> symbols in other character blocks. Examples include U+00B5 µ MICRO SIGN in
> the Latin-1 Supplement character block and U+2126 Ω OHM SIGN in the
> Letterlike Symbols character block. The *ohm sign* is canonically
> equivalent to the *capital omega*, and normalization would remove any
> distinction. Its use is therefore discouraged in favor of *capital omega*.
> The same equivalence does not exist between *micro sign* and *mu*, and
> use of either character as a micro sign is common. For Greek text, only the
> *mu* should be used.
>

ANGSTROM SIGN is, as Steve hopes, like OHM SIGN in that respect (see
Section 22.2, *sub* Unit Symbols
<https://www.unicode.org/versions/Unicode15.1.0/ch22.pdf#G20445>).

Best regards,

Robin Leroy