Keypad

keyboardkeypadsnumeric keypad
A keypad is a set of buttons arranged in a block or "pad" which bear digits, symbols or alphabetical letters.wikipedia
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Push-button telephone

10- or 12-button touch-tone telephonespush-buttonpush-button dialing
Numeric keypads are found on alphanumeric keyboards and on other devices which require mainly numeric input such as calculators, push-button telephones, vending machines, ATMs, Point of Sale devices, combination locks, and digital door locks. The invention of the Push-button telephone keypad is attributed to John E. Karlin, an industrial psychologist at Bell Labs in Murray Hill, NJ. On a telephone keypad, the numbers 1 through 9 are arranged from left to right, top to bottom with 0 in a row below 789 and in the center.
Although DTMF was the driving technology implemented in push-button telephones, some telephone manufacturers used push-button keypads to generate pulse dial signaling.

Telephone keypad

keypad12-key telephone keypaddial pad
The invention of the Push-button telephone keypad is attributed to John E. Karlin, an industrial psychologist at Bell Labs in Murray Hill, NJ. On a telephone keypad, the numbers 1 through 9 are arranged from left to right, top to bottom with 0 in a row below 789 and in the center.
A telephone keypad is the keypad installed on a push-button telephone or similar telecommunication device for dialing a telephone number.

Calculator

pocket calculatorcalculatorselectronic calculator
Numeric keypads are found on alphanumeric keyboards and on other devices which require mainly numeric input such as calculators, push-button telephones, vending machines, ATMs, Point of Sale devices, combination locks, and digital door locks. There is no standard for the layout of the four arithmetic operations, the decimal point, equal sign or other more advanced mathematical functions on the keypad of a calculator.
Keypad (input device) – consists of keys used to input numbers and function commands (addition, multiplication, square-root, etc.)

Combination lock

combinationcombination lockscombination dial
Numeric keypads are found on alphanumeric keyboards and on other devices which require mainly numeric input such as calculators, push-button telephones, vending machines, ATMs, Point of Sale devices, combination locks, and digital door locks.
Many doors use combination locks which require the user to enter a numeric sequence on a keypad to gain entry.

Computer keyboard

keyboardkeyboardsalphanumeric keyboard
Numeric keypads are found on alphanumeric keyboards and on other devices which require mainly numeric input such as calculators, push-button telephones, vending machines, ATMs, Point of Sale devices, combination locks, and digital door locks.
A keyboard with few keys is called a keypad.

Mobile phone

cell phonemobilemobile phones
Mobile phone
An input mechanism to allow the user to interact with the phone. These are a keypad for feature phones and touch screens for most smartphones.

Electronic lock

digital door lockdigital lockselectro-mechanical locks
Numeric keypads are found on alphanumeric keyboards and on other devices which require mainly numeric input such as calculators, push-button telephones, vending machines, ATMs, Point of Sale devices, combination locks, and digital door locks.

E.161

ITU E.161ITU-T E.161letters assigned to most of the digits
Many devices follow the E.161 standard for their arrangement.

Numeric keypad

number padnumpadnumerical keypad
A computer keyboard usually has a small numeric keypad on the side, in addition to the other number keys on the top, but with a calculator-style arrangement of buttons that allow more efficient entry of numerical data.

Laptop

laptop computerlaptopsnotebook computer
Many laptop computers have special function keys which turn part of the alphabetical keyboard into a numerical keypad as there is insufficient space to allow a separate keypad to be built into the laptop's chassis.

Arithmetic

arithmetic operationsarithmeticsarithmetic operation
There is no standard for the layout of the four arithmetic operations, the decimal point, equal sign or other more advanced mathematical functions on the keypad of a calculator.

Decimal separator

decimal pointdecimal markthousands separator
There is no standard for the layout of the four arithmetic operations, the decimal point, equal sign or other more advanced mathematical functions on the keypad of a calculator.

Equals sign

equal sign=equality
There is no standard for the layout of the four arithmetic operations, the decimal point, equal sign or other more advanced mathematical functions on the keypad of a calculator.

John Karlin

John E. Karlin
The invention of the Push-button telephone keypad is attributed to John E. Karlin, an industrial psychologist at Bell Labs in Murray Hill, NJ. On a telephone keypad, the numbers 1 through 9 are arranged from left to right, top to bottom with 0 in a row below 789 and in the center.

Bell Labs

Bell Telephone LaboratoriesBell LaboratoriesAT&T Bell Laboratories
The invention of the Push-button telephone keypad is attributed to John E. Karlin, an industrial psychologist at Bell Labs in Murray Hill, NJ. On a telephone keypad, the numbers 1 through 9 are arranged from left to right, top to bottom with 0 in a row below 789 and in the center.

Asterisk

*asterisksstar
Telephone keypads also have the special buttons labelled * (star) and # (octothorpe, number sign, "pound", "hex" or "hash") on either side of the zero key.

Number sign

#hashhash symbol
Telephone keypads also have the special buttons labelled * (star) and # (octothorpe, number sign, "pound", "hex" or "hash") on either side of the zero key.

Telephone

phonetelephonesLocal Telephone Service
The keys on a telephone may also bear letters which have had several auxiliary uses, such as remembering area codes or whole telephone numbers.

Telephone numbering plan

Area codeCalling codearea codes
The keys on a telephone may also bear letters which have had several auxiliary uses, such as remembering area codes or whole telephone numbers.

Keyboard technology

mechanical keyboardkeyboardskeypad
Keyboard technology

Mobile phone features

featuresmobile phone contentCameras in mobile phones
An input mechanism to allow the user to interact with the phone. The most common input mechanism is a keypad, but touch screens are also found in smartphones.

Remote keyless system

keyless entryremote keyless entrykeyless entry system
The term keyless entry system originally meant a lock controlled by a keypad located at or near the driver's door, which required entering a predetermined (or self-programmed) numeric code.

Apollo Guidance Computer

guidance computerLM guidance computerApollo 11's lunar descent
Astronauts communicated with the AGC using a numeric display and keyboard called the DSKY (for display&keyboard, pronounced 'DISS-key').