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Isn't that more like switching to a different character set, with supporting fonts having to be already present? Or what are you referring to?

I was thinking along the lines of online (or inline) fonts, similar to web fonts in CSS, which would allow for arbitrary custom glyphs.

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Sixel graphics on the vt220 (1983) worked by defining a custom font of 10x10 px characters (9x10 in high-resolution mode), which you could then switch to for any given character.

As far as I know, there is no terminal emulator that supports this flavor if sixel graphics.

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