Quaternary numeral system

The quaternary numeral system is a way of counting or writing numbers using only four symbols. Instead of just 0, 1, 2 and 3 like in the decimal system, in the quaternary system those symbols are usually 0, 1, 2, and 3. Quaternary can also be called base-4 because it uses four different symbols. You use these symbols to represent any number from 0 to 3, just like in the decimal system, which uses 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 to represent any number from 0 to 9. So when a number has three symbols in the quaternary system, it is like having three digits (or numbers) in the decimal system. For example, the quaternary number 120 is the same as the decimal number 9 because 1x4x4 + 2x4 + 0 = 9.