table 3-6. UTF-8 bit distribution

yitin--- via Unicode <[email protected]> Thu, 11 Sep 2025 15:21:31 -0400

Newsgroups	gmane.text.unicode.general
Message-ID	<[email protected]>

https://www.unicode.org/versions/Unicode16.0.0/core-spec/chapter-3/#G27288

What is the significance of using different letters (x,y,z,u)
for different bits?  I don't see any consistent pattern in
the naming.  https://www.rfc-editor.org/rfc/rfc3629 just
uses x for all of them.