Digit (noun)

1. A finger or toe.
2. A symbol or character used in counting or mathematics, especially one of 0 to 9.
3. A unit of measurement of length, typically about 3/4 inch (2 cm).

Origin:

Late middle english: from latin digitus "finger or toe", from digitus "pointing, counting", from the verb dare "point at".

Examples:

1. He held up five digits to indicate the number.
2. He entered his PIN using the keypad's digits.
3. The area of the display screen is measured in square digits.
4. The number has six digits.
5. He lost a digit in an accident.