section_path: Overview
section_name: Overview
paragraph_text: Overview
  
  The Arabic script has been adapted for use in a wide variety of languages aside from Arabic, including Persian, Malay and Urdu, which are not Semitic. Such adaptations may feature altered or new characters to represent phonemes that do not appear in Arabic phonology. For example, the Arabic language lacks a voiceless bilabial plosive (the sound), therefore many languages add their own letter to represent in the script, though the specific letter used varies from language to language. These modifications tend to fall into groups: Indian and Turkic languages written in the Arabic script tend to use the Persian modified letters, whereas the languages of Indonesia tend to imitate those of Jawi. The modified version of the Arabic script originally devised for use with Persian is known as the Perso-Arabic script by scholars.
  
  When the Arabic script is used to write Serbo-Croatian, Sorani, Kashmiri, Mandarin Chinese, or Uyghur, vowels are mandatory. The Arabic script can, therefore, be used as a true alphabet as well as an abjad, although it is often strongly, if erroneously, connected to the latter due to it being originally used only for Arabic.
  
  Use of the Arabic script in West African languages, especially in the Sahel, developed with the spread of Islam. To a certain degree the style and usage tends to follow those of the Maghreb (for instance the position of the dots in the letters fāʼ and qāf). Additional diacritics have come into use to facilitate the writing of sounds not represented in the Arabic language. The term ʻAjamī, which comes from the Arabic root for "foreign", has been applied to Arabic-based orthographies of African languages.