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Arabic Presentation Forms-B is a Unicode block encoding spacing forms of Arabic diacritics, and contextual letter forms. The special codepoint ZWNBSP ( zero width no-break space ) is also here, which is only meant for a byte order mark (that may precede text, Arabic or not, or be absent).
The Arabic Extended-B and Arabic Extended-A ranges encode additional Qur'anic annotations and letter variants used for various non-Arabic languages. The Arabic Presentation Forms-A range encodes contextual forms and ligatures of letter variants needed for Persian, Urdu, Sindhi and Central Asian languages.
Such use is not recommended, and may only have an effect only on Arabic letters encoded with compatibility characters for Arabic variant forms (in the U+FExx block), whose usage is strongly discouraged (you should use the standard letters, with the ZWJ and ZWNJ controls when needed), or on some Arabic texts that used this mechanism with ...
Constable, Peter (2016-10-28), Script property of Arabic Letter Mark and interaction with digit substitution mechanisms L2/17-016 Moore, Lisa (2017-02-08), "Consensus 150-C24", UTC #150 Minutes , Change the Script property of U+061C from Common to Arabic, and change Script_Extensions from Default to Arabic, Syriac, and Thaana, for Unicode 10.0.
MSA = Letters used in Modern Standard Arabic. CA = Letters used in Classical Arabic. AD = Letters used in some regional Arabic Dialects. "Arabic" = Letters used in Classical Arabic, Modern Standard Arabic, and most regional dialects. "Farsi" = Letters used in modern Persian. FW = Foreign words: the letter is sometimes used to spell foreign words.
The Standard Arabic Technical Transliteration System, commonly referred to by its acronym SATTS, is a system for writing and transmitting Arabic language text using the one-for-one substitution of ASCII-range characters for the letters of the Arabic alphabet. Unlike more common systems for transliterating Arabic, SATTS does not provide the ...
The Arabic alphabet, [a] or the Arabic abjad, is the Arabic script as specifically codified for writing the Arabic language. It is written from right-to-left in a cursive style, and includes 28 letters, [ b ] of which most have contextual letterforms.
Arabic typography is the typography of letters, graphemes, characters or text in Arabic script, for example for writing Arabic, Persian, or Urdu. 16th century Arabic typography was a by-product of Latin typography with Syriac and Latin proportions and aesthetics.