Numeric keypad
A numeric keypad, number pad, numpad, or ten key, is the calculator-style group of ten numeric keys accompanied by other keys, usually on the far right side of computer keyboard. This grouping allows quick number entry with the right hand, without the need to use both hands on number row of main keyboard. On a standard IBM PC keyboard, numpad has 17 keys, including digits to, , , , and symbols, ,, and keys. On smaller keyboards, the numeric keypad can be implemented as alternative markings on alphabetic keys or added as a separate unit, that can be connected to a device by means such as USB; some of these may include keys not found on a standard numpad, such as a spacebar or a key.
Sometimes it is necessary to distinguish between a key on the numpad and an equivalent key elsewhere on the keyboard. For example, depending on the software in use, pressing the numpad's key may produce different results than pressing the alphanumeric key. In such cases, the numpad-specific key may be indicated as e.g.,,, or likewise to remove ambiguity.
Numeric keypads usually operate in two modes. When is off, keys,,, and act like arrow/navigation keys up, right, down, and left; and,,, and act like,,, and, respectively. With on, digit keys produce the corresponding digit. On Apple Macintosh computers, which lack a key, the numeric keypad always produces only numbers; the key is replaced by the key.
The arrangement of digits on numeric keypads with the -- keys two rows above the -- keys is derived from calculators and cash registers. It is notably different from the layout of telephone Touch-Tone keypads which have the -- keys on top and -- keys on the third row.
Numeric keypads are useful for entering long sequences of numbers quickly, such as in spreadsheets, financial/accounting programs, and calculators. Input in this style is similar to a calculator or adding machine.
A numeric keypad is also useful on Windows PCs for typing alt codes for special symbols; for example, the degree symbol, °, can be typed on these computers with the sequence.
To maintain their compact size, most laptops do not include a numeric keypad on their keyboard ; even some desktop keyboards designed for compactness omit a numpad. To compensate, most such keyboards include integrated into a function key and then press keys like to produce their numpad counterpart.
Chinese input methods
The numeric keypad is used by some systems for input of Chinese characters, for example CKC Chinese Input System and Q9 input method.Computer games and mousing alternative
Numeric keypads are also used for playing some older computer games where the player must control a character, such as roguelikes and Sid Meier's Pirates!. For keyboards without a numeric keypad, some games provide alternative movement keys, such as classic Rogue's HJKL keys.The numeric keypad can also be an alternative to the WASD keys for navigation in computer gaming. This can be an attractive option for left-handed people who prefer to use the mouse with their left hand.
Most operating systems have a mouse keys accessibility feature where mouse navigation can be done using the numeric keypad, with the other keys adapted to be mouse buttons.