A base-8(octal) number system, also known as octal, is a numeral system that uses eight digits: 0, 1, 2, 3, 4, 5, 6, and 7. Each digit represents a value that is a power of 8. The rightmost digit represents 8^0 (which is 1), the next digit represents 8^1 (which is 8), the next digit represents 8^2 (which is 64), and so on.