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International uniformity of braille alphabets
(詳細はbraille alphabets of the world as much as possible, so that literacy in one braille alphabet readily transfers to another. Unification was first achieved by a convention of the ''International Congress on Work for the Blind'' in 1878, where it was decided to replace the mutually incompatible national conventions of the time with the French values of the basic Latin alphabet, both for languages which use Latin-based alphabets and, through their Latin equivalents, for languages which use other scripts. However, the unification did not address letters beyond these 26, leaving French and German Braille partially incompatible, and as braille spread to new languages with new needs, national conventions again became disparate. A second round of unification was undertaken under the auspices of UNESCO in 1951, setting the foundation for international braille usage today.
==Numerical order==
Braille arranged his characters in decades (groups of ten), and assigned the 25 letters of the French alphabet to them in order. The characters beyond the first 25 are the principal source of variation today.
In the first decade, only the top four dots are used; the two supplementary characters have dots only on the right. These patterns are repeated for the second decade, with the addition of a diacritic at dot 3; for the third, at dots 3 and 6; for the fourth, at 6; and for the fifth decade, by duplicating the first decade within the lower four dots.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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