Perso-Arabic script

The Persian alphabet (Persian: الفبای فارسی, romanized: Alefbâ-ye Fârsi), also known as the Perso-Arabic script, is the right-to-leftalphabet used for the Persian language. An Arabic-based alphabet, it is largely identical to the Arabic alphabet with four additional letters: پ, چ, ژ, and گ (the sounds 'p', 'ch', 'zh', and 'g', respectively), in addition to the obsolete ڤ that was used for the sound /β/. This letter is no longer used in Persian, as the [β]-sound changed to [b], e.g. archaic زڤان/zaβɑn/ > زبان/zæbɒn/ 'language'. Although the sound /β/ (ڤ) is written as "و" nowadays in New Persian), it is different to the Arabic /w/ (و) sound, which uses the same letter.