Gaf , is the name of different Perso-Arabic letters, all representing /ɡ/. They are all derived from the letter kāf, with additional diacritics, such as dots and lines. In name and shape, it is a variant of kaf. It is also one of the five letters the Persian alphabet added to the Arabic alphabet (the others being ژ, پ, and چ in addition to the obsolete ڤ). Its numerical value is 5000 (see Abjad numerals). There are four forms, each used in different alphabets: