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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.
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 ...
Numeric keyboards contain only numbers, mathematical symbols for addition, subtraction, multiplication, and division, a decimal point, and several function keys. They are often used to facilitate data entry with smaller keyboards that do not have a numeric keypad, commonly those of laptop computers. [18]
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 ...
QWERTZ keyboards usually change the right Alt key into an Alt Gr key to access a third level of key assignments. This is necessary because the language-specific characters leave no room to have all the special symbols of ASCII , needed by programmers among others, available on the first or second (shifted) levels without unduly increasing the ...
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
AZERTY layout used on a keyboard. AZERTY (/ ə ˈ z ɜːr t i / ə-ZUR-tee) is a specific layout for the characters of the Latin alphabet on typewriter keys and computer keyboards.The layout takes its name from the first six letters to appear on the first row of alphabetical keys; that is, (A Z E R T Y).
A few ergonomic keyboards do not have the typical one key per letter, such as a keyer or a keyless ergonomic keyboard. [23] For example, DataHand eliminates the need for any wrist motion or finger extension; each finger has five separate switches triggered by buttons or paddles.