xahlee.info/comp/unicode_brail
8-dots braille ⣮ ⣯ ⣰ ⣱ ⣲ ⣳ ⣴ ⣵ ⣶ ⣷ ⣸ ⣹ ⣺ ⣻ ⣼ ⣽ ⣾ ⣿

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braille is a fast declining tech. because, screen readers and audio are replacing it.

xahlee.info/comp/unicode_brail
when you have 6 dots, each is on/off, you have 2^6 = 64 possibilities.
when you have 8 dots, you have 2^8 = 256 possibilities.

xahlee.info/comp/unicode_dingb
another combinatorial unicode char set is the trigram.
Note that, in these MONOGRAM, TRIGRAM, TETRAGRAM, HEXAGRAM, some allows the bar to break into 3 pieces, while other only 2.

@xahlee All but a couple of the blind programmers I know who don't use some form of screen magnification use a Refreshable Braille Display driven by a screen reader. (That is, the screen reader presents Braille rather than audio.)

Now, to be fair, I don't know what non-technical blind users do, since I don't really know what non-technical users do period.

But even though I'm not a very strong Braille reader and use magnifying glasses and large fonts in my day to day life, when I was younger I tried both Nemeth code and audio for textbooks, and for mathematically heavy material audio was kind of a miserable experience.

@azure @xahlee I've never conversed with a blind programmer/hacker, but I've met a few blind people. One old non-expert used JAWS (aural) on Windows with mostly MS Word, Outlook, Internet Explorer and Firefox. His biggest challenge of course is user-abusive web sites.

Another more advanced blind computer user I have hung out with uses Linux and probably Orca (aural). He might have used some kind of Android phone, too.

I know that braille terminals exist but I've never talked to a user.

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