https://invisible-island.net/xterm/
uxterm - X terminal emulator for Unicode (UTF-8) environments
uxterm [ xterm-options ]
uxterm is a wrapper around the xterm(1) program that invokes the latter
program with the "UXTerm" X resource class set. All arguments to
uxterm are passed to xterm without processing; the -class and -u8
options should not be specified because they are used by the wrapper.
See the xterm manual page for more information on xterm-options.
The environment's locale settings (see "ENVIRONMENT" below) are used to
discern the locale's character set. If no current locale can be
determined, the locale "en_US" (the English language as used in the
territory of the United States) is assumed. The locale(1) utility is
used to determine whether the system supports the selected locale. If
it does not, uxterm will exit with an error and report the output of
locale.
Note: uxterm may produce unexpected results if the current locale is
set to one in which the UTF-8 character encoding is not supported, or
if fonts using the ISO 10646-1 character set are not available. In the
Debian system, the "xfonts-base" package provides the fonts that uxterm
uses by default. To change the fonts uxterm uses, edit the
/etc/X11/app-defaults/UXTerm file.
A similar wrapper, koi8rxterm(1), is available for KOI8-R environments.
LC_ALL, LC_CTYPE, LANG
The values of these variables are checked, in order, to
determine the character set used by the current locale.
Thomas Dickey
locale(1), locale(7), koi8rxterm(1), xterm(1) Patch #395 2024-10-24 UXTERM(1)