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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 ...
The E00 key (left of 1) with AltGr provides either vertical bar (|) (OS/2's UK166 keyboard layout, Linux/X11 UK keyboard layout) or broken bar (¦) (Windows UK/Ireland keyboard layout) Support for the diacritics needed for Scots Gaelic and Welsh was added to Windows and ChromeOS using a "UK-extended" setting (see below ); Linux and X-Windows ...
PC keyboards designed for non-English use included other methods of inserting these characters, such as national keyboard layouts, the AltGr key or dead keys, but the Alt key was the only method of inserting some characters, and the only method that was the same on all machines, so it remained very popular.
IBM states that AltGr is an abbreviation for alternate graphic. [3] [4]Sun Microsystems keyboard, which labels the key as Alt Graph. A key labelled with some variation of "Alt Graphic" was on many computer keyboards before the Windows international layouts.
The Alt key on an Apple keyboard. Since the 1990s, Alt has been printed on the Option key on most Mac keyboards. As of 2017, the newest Apple keyboards do not contain the Alt label. Alt is used in non-Mac software, such as non-macOS Unix and Windows programs, but in macOS it is always referred to as the Option key.
The symbol "₪", which represents the sheqel sign, can be typed into Windows, Linux and ChromeOS with the Hebrew keyboard layout set, using AltGr+4. On Mac OS X, it can be typed as ⇧ Shift+7. If a US or EU layout is in use, the sequence is Alt+ 20AA for some Windows applications and Ctrl+⇧ Shift+u 20AAspace on Unix heritage systems.
Some older Unix/Linux software, such as Emacs, uses the left Alt key as a "Meta" key, which harks back to older MIT or LISP computers. [ 5 ] ChromeOS uses the US and UK Windows layouts, except that the Caps-Lock key is labelled with a "fisheye" ( ) and by default acts as an "everything" search key.
Hex input of Unicode must be enabled. In Mac OS 8.5 and later, one can choose the Unicode Hex Input keyboard layout; in OS X (10.10) Yosemite, this can be added in Keyboard → Input Sources. Holding down ⌥ Option, one types the four-digit hexadecimal Unicode code point and the equivalent character appears; one can then release the ⌥ Option ...