The binary system uses only the digits `` 0 '' and `` 1 '' , while the octal system uses the digits from `` 0 '' through `` 7 '' .
The ten digits 0 , 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , and 9 are both digits and numerals . Some numeral system need more than ten digits .
The ten digits 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 are neither digits nor numerals. Some numeral system need less than ten digits.