[cosmos0072]

If you mean the Unicode glyphs listed at https://en.m.wikipedia.org/wiki/Block_Elements they are supported - you just need a display driver that can render them. For example, `twin --hw=xft` (it's the default) or `twin --hw=X11`, both with a font that contains them

[JdeBP]

Xe means the Unicode block that is actually named "Symbols For Legacy Computing". It's not in the BMP. Some bloke named Bruce was doing TUI windows with scrollbars and sizer/menu boxes some years before TurboVision and code page 437. (-:

[panzi]

Indeed I meant these: https://en.wikipedia.org/wiki/Symbols_for_Legacy_Computing

I use them in some tiny hobby projects like these:

https://github.com/panzi/progress-pride-bar

https://github.com/panzi/bad-apple-terminal

https://github.com/panzi/js-unicode-bar-chart

https://github.com/panzi/js-unicode-plot

https://github.com/panzi/js-unicode-progress-bar

https://github.com/panzi/python-term-flags