bug#32599: 25.2; Feature request: input PUA characters by name

[Eli Zaretskii]

> From: Janusz S. Bień <jsbien@mimuw.edu.pl>
> Date: Tue, 26 Apr 2022 18:09:53 +0200
> Cc: 32599@debbugs.gnu.org, Lars Ingebrigtsen <larsi@gnus.org>
> 
> What is needed to treat the character as a letter? To be precise, I
> would forward-word to go to the end of ahb, now it stops after a.

You need to manually assign that character its properties.  See
characters.el.  You may also need to manually assign some Unicode
properties using put-char-code-property.