numeric keypad
A keypad that has become a standard feature of PC keyboards, consisting of a rectangular array of 17 extra keys at the right-hand end: 0-9, ., Num Lock, /, *, -, + and Enter. Apart from Num Lock, these typically duplicate the function of other keys but are designed to make entering basic numerical calculations as quick as on a digital calculator. It is often possible to assign completely different functions to these keys according to the needs of a particular application.