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It was invented by Louis Braille (1809-1852), a French teacher of the blind. It consists of patterns of raised dots arranged in cells of up to six dots in a 3 x 2 configuration.

Each cell represents a letter, numeral or punctuation mark.

Grade 3, which is used only in personal letters, diaries, and notes. It is a kind of shorthand, with entire words shortened to a few letters.