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ISO/IEC 9995 Information technology — Keyboard layouts for text and office systems is an ISO/IEC standard series defining layout principles for computer keyboards. It does not define specific layouts but provides the base for national and industry standards which define such layouts.
Many, but not all, computer keyboards have a numeric keypad to the right of the alphabetic keyboard, often separated from the other groups of keys such as the function keys and system command keys, which contains numbers, basic mathematical symbols (e.g., addition, subtraction, etc.), and a few function keys.
Many computer fonts consist of glyphs that are indexed by the numerical code of the corresponding character. With the advent and widespread acceptance of Unicode [ 5 ] and bit-agnostic coded character sets , [ clarification needed ] a character is increasingly being seen as a unit of information , independent of any particular visual manifestation.
The technology of computer keyboards includes many elements. Many different keyboard technologies have been developed for consumer demands and optimized for industrial applications. The standard full-size (100%) computer alphanumeric keyboard typically uses 101 to 105 keys; keyboards integrated in laptop computers are typically less comprehensive.
A typical 105-key computer keyboard, consisting of sections with different types of keys. A computer keyboard consists of alphanumeric or character keys for typing, modifier keys for altering the functions of other keys, [1] navigation keys for moving the text cursor on the screen, function keys and system command keys—such as Esc and Break—for special actions, and often a numeric keypad ...
On-screen keyboards can be used to type and enter data without using the physical keyboard. An on-screen keyboard may contain all the standard keys including all letters, numbers, symbols, and system keys like Home, End, Insert, Page Up and Page Down, Ctrl, Alt, Caps, and Shift, and can even extend the set of characters available by simulating ...
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Collation of data is sometimes done in this order rather than "standard" alphabetical order (collating sequence). The main deviations in ASCII order are: All uppercase come before lowercase letters; for example, "Z" precedes "a" Digits and many punctuation marks come before letters