Numerical digit

A numerical digit is a single symbol (such as '2' or '5') used alone, or in combinations (such as '25'), to represent numbers (such as the number 25) according to some positional numeral systems. The single digits (as one-digit-numerals) and their combinations (such as '25') are the numerals of the numeral system they belong to. The name 'digit' comes from the fact that the ten digits (Latin digiti meaning fingers) of the hands correspond to the ten symbols of the common base 10 numeral system, i.e. the decimal (ancient Latin adjective decem meaning ten) digits. A numerical digit is a single symbol (such as '2' or '5') used alone, or in combinations (such as '25'), to represent numbers (such as the number 25) according to some positional numeral systems. The single digits (as one-digit-numerals) and their combinations (such as '25') are the numerals of the numeral system they belong to. The name 'digit' comes from the fact that the ten digits (Latin digiti meaning fingers) of the hands correspond to the ten symbols of the common base 10 numeral system, i.e. the decimal (ancient Latin adjective decem meaning ten) digits. For a given numeral system with an integer base, the number of digits required to express arbitrary numbers is given by the absolute value of the base. For example, the decimal system (base 10) requires ten digits (0 through to 9), whereas the binary system (base 2) has two digits (e.g.: 0 and 1). In a basic digital system, a numeral is a sequence of digits, which may be of arbitrary length. Each position in the sequence has a place value, and each digit has a value. The value of the numeral is computed by multiplying each digit in the sequence by its place value, and summing the results. Each digit in a number system represents an integer. For example, in decimal the digit '1' represents the integer one, and in the hexadecimal system, the letter 'A' represents the number ten. A positional number system has one unique digit for each integer from zero up to, but not including, the radix of the number system.