There are 256 possible combinations of dots in 8-dot braille (if you include a blank cell as a character).
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64There are 6 basic dot locations in Braille, enough to create about 720 different characters. The basic 26 characters are the English letters A to Z and numbers (1 to 9 and zero, which are the same as letters A to J but indicated by a separate "number" symbol). There are special characters for accented letters in various languages. Characters may also be used for contractions, conjunctions, prepositions, music notation, and special symbols in math and various scientific fields.To view all the characters, see the related link.
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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.
There seven commonly used characters in the Roman numeral system. These are...I (1)V (5)X (10)L (50)C (100)D (500)M (1000)