The two digital states can be given various names: ON/OFF, true/false, high/low, 1/0, etc.. The 1 and 0 notation naturally leads to the use of binary (base 2) numbers. Octal (base 8) and hexadecimal (base 16) numbers are also used since they provide a condensed number notation. Decimal (base 10) numbers are not of much use in digital electronics.