A keypad is a block or pad of buttons set with an arrangement of digits, symbols, or alphabetical letters. Pads mostly containing numbers and used with computers are numeric keypads. Keypads are found on devices which require mainly numeric input such as calculators, television remotes, push-button telephones, vending machines, ATMs, point of sale terminals, combination locks, safes, and digital door locks. Many devices follow the E.161 standard for their arrangement.
A calculator
1984 flier for projected capacitance keypad
A push-button telephone is a telephone that has buttons or keys for dialing a telephone number, in contrast to a rotary dial used in earlier telephones.
The Western Electric No. 2500, a typical American 12-button phone of the 1970s and early 80s
Gigaset A165 push-button cordless telephone using DECT with a base station
Iskra ETA85 pushbutton telephone with pulse-dialing keypad (Yugoslavia, 1988).
Heemaf 1955 type wall telephone by Philips with DC signaling pushbutton dial (Netherlands, Dec.1962).