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

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.

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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.

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