Bonjour Hi Robin, how are you?
I'm curious if Unicode ever discussed subscript / superscripts that would
be useful for the rendering
of SI units in contexts where typography is not an option, as in the
context of this paper.
There seems to be some cases where unicode is insufficient
https://isocpp.org/files/papers/P3045R0.html#symbol-definition-examples,
and we have (tragically) to find ascii approximations

Thanks,

Corentin


On Wed, Jan 24, 2024 at 7:17 PM Robin Leroy via SG16 <sg16_at_[hidden]>
wrote:

> 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
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