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Re:Show HN: A dot matrix rendered using Braille characters by danellis on Monday August 16, 2021 @03:55PM (#28202136)
Reminds me somewhat of Teletext graphics, whose character set included 2x3-cell blocks that could be displayed either joined up or separated.

https://channel26.uk/teletext-design/

Re:Show HN: A dot matrix rendered using Braille characters by timfi on Monday August 16, 2021 @04:07PM (#28202272)
Similar characters actually exist in unicode as well irrc.

...On a side note, I think you kickstarted me down the path of abstracting the drawing algorithms and implicit matrix protocol out, just to make it easier to implement this with different character sets. One set for example could be [U+2596 .. U+259F, U+2589], so basically just a 2x2 grid per character.