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Where dots 7 and 8 are not raised, there is no distinction between 6-dot and 8-dot definitions. The Unicode name of a specific pattern mentions the raised dots: U+2813 ⠓ BRAILLE PATTERN DOTS-125 has dots 1, 2 and 5 raised. By exception, the zero dot raised pattern is named U+2800 ⠀ BRAILLE PATTERN BLANK. [4]
The Braille pattern dots-0 ( ⠀), also called a blank Braille pattern, is a 6-dot or 8-dot braille cell with no dots raised. It is represented by the Unicode code point U+2800, and in Braille ASCII with a space.
A raised dot can appear in any of the six positions, producing 64 (2 6) possible patterns, including one in which there are no raised dots. For reference purposes, a pattern is commonly described by listing the positions where dots are raised, the positions being universally numbered, from top to bottom, as 1 to 3 on the left and 4 to 6 on the ...
The 64 braille patterns are arranged into decades based on the numerical order of those patterns. The first decade are the numerals 1 through 0, which utilize only the top and mid row of the cell; the 2nd through 4th decades are derived from the first by adding dots to the bottom row; the 5th decade is created by shifting the first decade downwards.
The Braille pattern dots-356 ( ⠴) is a 6-dot braille cell with the middle right and both bottom dots raised, or an 8-dot braille cell with the upper-middle right and both lower-middle dots raised. It is represented by the Unicode code point U+2834, and in Braille ASCII with the number 0.
The Braille pattern dots-1246 ( ⠫) is a 6-dot braille cell with both top, the middle left, and bottom right dots raised, or an 8-dot braille cell with both top, the upper-middle left, and lower-middle right dots raised. It is represented by the Unicode code point U+282b, and in Braille ASCII with the dollar sign: $.