Braille
The six bit braille code is very limited, it only allows 64 different possible combinations. This means that many things need more than one braille character to be coded. One example for this is how numbers are coded in English braille: First there is a symbol that says the next symbol is a number, and then there is the symbol for the number.  The symbol for number is usually given only once; every symbol that follows is treated as a number, until there is a space.