keypad
n. B1 Intermediate US //ˈkiˌpæd// UK //kˈiːpæd// key·pad
n. a small set of buttons used to enter numbers or letters into a machine. You often find it on phones, calculators, or locks.
n. a small panel of keys used for entering data into a device. Often used in the context of electronic locks, calculators, or mobile phones.
I used the keypad to enter my PIN.
The hotel room door has a digital keypad where you enter your room number to unlock it.
Modern security systems often replace traditional mechanical locks with a keypad that allows users to input a unique code without carrying a physical key.
From key + pad.