[joouha]

This would allow more complex shapes to be drawn by combining multiple glyphs, which would be useful for complex TUI applications (there are only a limited number of box-drawing characters available) Also, this could allow drawing more than two colours per terminal cell.

[wonger_]

That's an interesting idea. The closest thing I can think of is using an extended box-drawing font: https://hpjansson.org/blag/2024/01/18/chafa-1-14-all-singing....

That doesn't solve the two-colors-per-cell challenge. But it makes for some very realistic terminal images.

For higher fidelity rendering, I think the next best option is supporting image protocols like sixels or Kitty inline raster images. I'm not sure how overprinting would compare to existing options.

[joouha]

I've just found that Mintty supports this

https://github.com/mintty/mintty/wiki/CtrlSeqs#overstrike

[yjftsjthsd-h]

Oh, like making arrows by overlaying - with > or ^ with |. I could see that.