The Arabic Mathematical Alphabetical Symbols block encodes characters used in Arabic mathematical expressions. The presentation forms are present only for compatibility with older standards, and are not currently needed for coding text.
The Arabic Presentation Forms-B range encodes spacing forms of Arabic diacritics, and more contextual letter forms. The Arabic Presentation Forms-A range encodes contextual forms and ligatures of letter variants needed for Persian, Urdu, Sindhi and Central Asian languages. 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 Supplement range encodes letter variants mostly used for writing African (non-Arabic) languages. The basic Arabic range encodes the standard letters and diacritics, but does not encode contextual forms (U+0621–U+0652 being directly based on ISO 8859-6) and also includes the most common diacritics and Arabic-Indic digits. Arabic Mathematical Alphabetic Symbols (1EE00–1EEFF, 143 characters).Ottoman Siyaq Numbers (1ED00–1ED4F, 61 characters).Indic Siyaq Numbers (1EC70–1ECBF, 68 characters).Arabic Extended-C (10EC0-10EFF, 3 characters).
Rumi Numeral Symbols (10E60–10E7F, 31 characters).Arabic Presentation Forms-B (FE70–FEFF, 141 characters).Arabic Presentation Forms-A (FB50–FDFF, 631 characters).Arabic Extended-A (08A0–08FF, 96 characters).Arabic Supplement (0750–077F, 48 characters).Īs of Unicode 15.0, the Arabic script is contained in the following blocks: The rules governing ligature formation in Arabic can be quite complex, requiring special script-shaping technologies such as the Arabic Calligraphic Engine by Thomas Milo's DecoType. In English, the common ampersand (&) developed from a ligature in which the handwritten Latin letters e and t (spelling et, Latin for and) were combined. Many scripts in Unicode, such as Arabic, have special orthographic rules that require certain combinations of letterforms to be combined into special ligature forms.
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