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The single dot in braille represents 'A'
It's 2 dots and 1 dot on the bottom then a triangle with the point towards the right then 2 dots in the middle with 1 dot on top on the right side and 1 dot on bottom to the left. Get a better look at this website below.
One raised dot equates to the letter "A" ; see related link to additional information concerning Braille .
In Braille, the number 11 is represented by two cells, each for the number 1. The Braille character for the number 1 is made up of the top dot (dot 1) in the cell. Therefore, 11 in Braille consists of two adjacent characters that both feature only the top dot.
There are 256 possible combinations of dots in 8-dot braille (if you include a blank cell as a character).
1824
Braille
26
The letter b in Braille is represented by 1,2 - that is, a dot in the top left and middle left cell.
(*As it is difficult to write out the dot forms in text, see the related link for Braille translations.)
Braille
dot system