AltGr пернесі және оның қолданылуы

Modifier key on some computer keyboards

AltGr (also Alt Graph) is a modifier key found on many computer keyboards (rather than a second Alt key found on US keyboards). It is primarily used to type special characters and symbols that are not widely used in the territory where sold, such as foreign currency symbols, typographic marks and accented letters. On a typical Windows compatible PC keyboard, the AltGr key, when present, takes the place of the right hand Alt key. The key at this location will operate as AltGr if a keyboard layout using AltGr is chosen in the operating system, regardless of what is engraved on the key. In macOS, the Option key has functions similar to the AltGr key. The AltGr key is used as an additional Shift key, to provide a third and a fourth (when Shift is also pressed) grapheme for most keys. Most are accented variants of the letters on the keys, but also additional symbols and punctuation marks. Some languages such as Bengali use this key when the number of letters of their alphabet is too large for a standard keyboard. For example, on the US International keyboard layout, the key can be used to insert four different characters:
→ c (lowercase — first level)
→ C (uppercase — second level)
→ © (copyright sign — third level)
→ ¢ (cent sign — fourth level)

IBM states that AltGr is an abbreviation for alternate graphic.

In most of the keyboard diagrams the symbol one gets when holding down AltGr is in blue in the lower right of the corner. If different, the symbol for Shift+AltGr is shown in the upper right.

The Windows version of the Belgian keyboard may only support a subset of these characters. Several of the AltGr combinations are themselves dead keys, which are followed by another letter to produce an accented version of that letter.

The combination results in the (obsolete) symbol ₢ for the former Brazilian currency, the Brazilian cruzeiro. The , , combinations are useful as a replacement for the "/?" key, which is physically absent on non Brazilian keyboards. Some software (e. g. Microsoft Word) will map to ® and to ™, but this is not standard behavior and was likely an accident owing to the fact that the combinations and were intended.

The new Finnish keyboard standard of 2008 (SFS 5966) was designed for easily typing 1) Finnish, Swedish, Danish and Norwegian; 2) Nordic minority languages and 3) European Latin letters (based on MES 2, with emphasis on contemporary proper nouns), without needing engravings different from those on existing standard keyboards of Finland and Sweden. AltGr and dead diacritic keys are extensively used, although letters of Finnish and Swedish are mostly provided as normal keys.

Some of these key combinations also result in different characters if the polytonic layout is used.

The Finnish multilingual keyboard standard adds many new characters to the traditional layout via the AltGr key, as shown in the image below (the blue characters can be written with the AltGr key; several dead key diacritics, shown in red, are also available as an AltGr combination).