[1] Compound Text Encoding (2010-12-20 16:36:19 +09:00) https://www.x.org/releases/X11R7.6/doc/xorg-docs/specs/CTEXT/ctext.html

[2] 関連: ISO/IEC 2022, 指示シーケンス, IRR, DOCS, Fp

[3] lcCT.c\xlibi18n\src - xorg/lib/libX11 - libX11 GIT Repository (mirrored from https://gitlab.freedesktop.org/xorg/lib/libx11), 2022-05-05T12:41:42.000Z, 2022-05-06T02:57:34.008Z https://cgit.freedesktop.org/xorg/lib/libX11/tree/src/xlibi18n/lcCT.c

[4] >>3 DOCS で UTF-8 が使えるなど >>1 より拡張されてる。