In the base 10 numeral system , in almost universal use today for mathematical operations , the symbols for natural numbers are written using ten digits : 0 , 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , and 9 .
There are 10 different symbols { 0 , 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , and 9 } used in the base ten number system .