Base-24 number system uses 24 symbols to code information. Most commonly, these symbols are, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, and 'A to N' (or alternatively 'a to n').
Base-8 (also called octal) number system uses eight symbols to code information. Most commonly, these symbols are, 0, 1, 2, 3, 4, 5, 6 and 7.