BRLTTY Reference Manual: Standard Braille Dot Numbering Convention

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## 13. Standard Braille Dot Numbering Convention

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:

1

  Top-left (row 1, column 1).

2

  Middle-left (row 2, column 1).

3

  Bottom-left (row 3, column 1).

4

  Top-right (row 1, column 2).

5

  Middle-right (row 2, column 2).

6

  Bottom-right (row 3, column 2).

Computer braille has introduced a fourth row at the bottom.

7

  Below-left (row 4, column 1).

8

  Below-right (row 4, column 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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