Base-16 (also known as hexadecimal) number system uses 16 symbols to code information. Most commonly, these symbols are, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, and 'A to F' (or alternatively 'a to f').
Base-5 (also called quinary) number system uses five symbols to code information. Most commonly, these symbols are, 0, 1, 2, 3 and 4.