Standard Braille Dot Numbering Convention
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A standard braille cell consists of six dots arranged in three rows and two
columns. Each dot can be specifically identified by its number as follows:

   Dot  Position     Row  Col
    1   top-left      1    1
    2   middle-left   2    1
    3   bottom-left   3    1
    4   top-right     1    2
    5   middle-right  2    2
    6   bottom-right  3    2

Computer braille has introduced a fourth row at the bottom.

   Dot  Position     Row  Col
    7   below-left    4    1
    8   below-right   4    2

Perhaps a picture will make this numbering convention easier to understand.

   1 o o 4
   2 o o 5
   3 o o 6
   7 o o 8

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