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Here is a 4x4 font: https://simplifier.neocities.org/4x4.html .

BESM-6 used to show CPU registers content with lights ( http://www.mailcom.com/besm6/ ); with this font, each 48-bit register could show 3 letters.

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I think the 4x4 is legible only when you are already used to it and/or have the the full font as a reference. There are several letters and numbers which, when seen on their own, cannot be unambiguously deciphered.

Look, I'm not going to deny its legibility, but I (and this is my opinion only) don't like it's appearance. It's pretty impressive considering the constraints though. This is what I meant by ugly territory in my original comment.

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