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Louis Braille (as he was called) created a system where each letter of the alphabet was represented by a number of (maximum: 6) dots. For making those dots he originally used a stitching awl.
Dots 1, 2, 4 and 6 - the same as an ED sign.
Almost all braille is made up of six dots. However, some refreshable Braille displays use eight dots in each cell to save room and make reading quicker.
The letter A in braille uses a single dot in the upper left corner of the braille cell. All other braille letters use 2 or more dots.
braille writing is with dots so blind people can feel the dots