0 a set of buttons with numbers on them used to operate a television, telephone, etc -- кнопочная панель
The trapper (returning champion) would stand at the end of a path behind a keypad with three buttons and a red button.
Some card readers have their own numeric keypad.
The reason that the keypad of keyboards and calculators are different is the subject of some uncertainty.
This enables the caller to use the telephone keypad to select the required extension, where direct dialling-in to the extension is not available, or to speak to an operator.
Some people find it difficult to reach the keypad and others—for example, blind and visually impaired people—find it difficult to manipulate.
Functionally, two types of controls are used: "discrete" or "switch" type controls like a keypad, and "proportional" controls, giving a continuously variable control command like a joystick.
The subject responded by performing the designated addition or subtraction and if a single positive digit was the answer, then this result was entered on the keypad.
The parameter names "key1" and "key2" refer to keys of a keypad or switches on the input connector and the parameter "x-speed" is introduced when cartesian control is specified.
