Arabic alphabet

The Arabic alphabet is the script used for writing the Arabic language. Because the Qur'an, the holy book of Islam, is written with this alphabet, its influence spread with that of Islam and it has been, and still is, used to write many other languages from families unrelated to the Semitic languages, such as Persian and Urdu. (See fuller list below.)

Computers and the Arabic alphabet

The Arabic alphabet can be encoded using several character sets, including ISO-8859-6 and Unicode, in the latter thanks to the "Arabic segment", entries U+0600 to U+06FF. However, neither of these sets indicate the form each character should take in context. It is left to the rendering engine to select the proper glyph to display for each character.

Related Topics:
Character set - ISO-8859-6 - Unicode - Rendering engine - Glyph

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When one wants to encode a particular written form of a character, there are extra code points provided in Unicode which can be used to express the exact written form desired. The Arabic presentation forms A (U+FB50 to U+FDFF) and Arabic presentation forms B (U+FE70 to U+FEFF) contain most of the characters with contextual variation as well as the extended characters appropriate for other languages. These effects are better achieved in Unicode by using the zero width joiner and non-joiner, as these presentation forms are deprecated in Unicode, and should generally only be used within the internals of text-rendering software, when using Unicode as an intermediate form for conversion between character encodings, or for backwards compatibility with implementations that rely on the hard-coding of glyph forms.

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Finally, the Unicode encoding of Arabic is in logical order, that is, the characters are entered, and stored in computer memory, in the order that they are written and pronounced without worrying about the direction in which they will be displayed on paper or on the screen. Again, it is left to the rendering engine to present the characters in the correct direction, using Unicode's bi-directional text features. In this regard, if the Arabic words on this page are written left to right, it is an indication that the Unicode rendering engine used to display them is out-of-date. For more information about encoding Arabic, consult the Unicode manual available at http://www.unicode.org/

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• Multilingual Computing in Arabic with Windows, major word processors, web browsers, Arabic keyboards, and Arabic transliteration fonts

Arabic keyboard layout