1. Braille
Wikipedia definition
2. BrailleThe Braille system is a method that is widely used by people who are visually impaired to read and write, and was the first digital form of writing. Braille was devised in 1825 by Louis Braille, a blind Frenchman. Each Braille character, or cell, is made up of six dot positions, arranged in a rectangle containing two columns of three dots each. A dot may be raised at any of the six positions to form sixty-four (2) possible subsets, including the arrangement in which no dots are raised.
Read “Braille” on English Wikipedia
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Read “Braille” on DBpedia


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