Yep. Except the additional symbol is the symbol representing 10. For example, base 16 (hexadecimal) has 16 "ones place" symbols: 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F. The number after F (F representing the amount in base sixteen that in base ten is 15) in base sixteen would be denoted 10 or 1*16^1 +...