Le mer. 23 oct. 2024 à 21:59, Mateusz Pusz via SG16 <sg16_at_[hidden]>
a écrit :

> 1. Did I choose the correct Unicode symbols for those?
>
The other characters seem fine, but this one seems odd to me:

> Mathematical Italic Small Pi 𝜋 u8"\U0001D70B" "pi"

Is this meant to be the number that is approximately equal to 22/7? (The
rest of this email assumes that this is the case. If this is meant to be
something related to the pion <https://en.wikipedia.org/wiki/Pion> or
another use of that Greek letter, please ignore this email.)

In that case, whether it should be italic or not depends on your
mathematical typesetting tradition (for instance, French traditions use
upright type for all lowercase Greek, Anglo-Saxon traditions use italics
for all lowercase Greek).

Conveniently, ISO has guidance on that, in ISO 80000-2:2019 *Quantities and
units* Part 2: *Mathematics*, whose Clause 4 says that mathematical
constants and functions that do not depend on context are in upright type,
and explicitly gives the example of π.

Given that, and given also prior practice in WG 9
<http://www.ada-auth.org/standards/2yaarm/html/AA-A-5.html#I7375>, it seems
to me that it would be best to use U+03C0 π GREEK SMALL LETTER PI as the
identifier as the identifier for π.

(And then users who happen to be mathematicians can merrily use 𝜋 for,
say, a permutation, without shadowing π 🙃.)

Best regards,

Robin Leroy