A system of printing or writing devised for blind people. Developed by the Frenchman Louis Braille, the system is based on six raised dots which can be organised in diﬀerent combinations within two grades. Each system in Grade I represents an individual letter or punctuation mark. Grade II’s symbols represent common combinations of letters or individual words. Braille is accepted for all written languages, mathematics, science and music, with Grade II the more popular type.
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