Base-36 number system uses 36 symbols to code information. Most commonly, these symbols are, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, and 'A to Z' (or alternatively 'a to z').
Base-2 (also called binary) number system uses only two symbols to code information. Most commonly, these two symbols are, 0 and 1.