Persian (/ˈpɜːrʒən, -ʃən/), also known by its endonym Farsi (فارسی, fārsi, (listen)), is a Western Iranian language belonging to the Iranian branch of the Indo-Iranian subdivision of the Indo-European languages. It is a pluricentric language predominantly spoken and used officially within Iran, Afghanistan and Tajikistan in three mutually intelligible standard varieties, namely Iranian Persian, Dari Persian (officially named Dari since 1958) and Tajiki Persian (officially named Tajik since the Soviet era). It is also spoken natively in the Tajik variety by a significant population within Uzbekistan, as well as within other regions with a Persianate history in the cultural sphere of Greater Iran. It is written officially within Iran and Afghanistan in the Persian alphabet, a derivation of the Arabic script, and within Tajikistan in the Tajik alphabet, a derivation of Cyrillic. The Persian language is a continuation of Middle Persian, the official religious and literary language of the Sasanian Empire, itself a continuation of Old Persian, which was used in the Achaemenid Empire. It originated in the region of Fars (Persia) in southwestern Iran. Its grammar is similar to that of many European languages. Throughout history, Persian has been a prestigious cultural language used by various empires in Western Asia, Central Asia, and South Asia. Old Persian written works are attested in Old Persian cuneiform on several inscriptions from between the 6th and the 4th centuries BC, and Middle Persian literature is attested in Aramaic-derived scripts (Pahlavi and Manichaean) on inscriptions from the time of the Parthian Empire and in books centered in Zoroastrian and Manichaean scriptures from between the 3rd to the 10th century AD. New Persian literature began to flourish after the Arab conquest of Iran with its earliest records from the 9th century, since then adopting the Arabic script, while the use of Arabic had strikingly spread over the region. Persian was the first language to break through the monopoly of Arabic on writing in the Muslim world, with the writing of Persian poetry developed as a court tradition in many eastern courts. Some of the famous works of medieval Persian literature are the Shahnameh of Ferdowsi, the works of Rumi, the Rubaiyat of Omar Khayyam, the Panj Ganj of Nizami Ganjavi, the Divān of Hafez, The Conference of the Birds by Attar of Nishapur, and the miscellanea of Gulistan and Bustan by Saadi Shirazi. Persian has left a considerable influence on its neighboring languages, including other Iranian languages, the Turkic languages, Armenian, Georgian and the Indo-Aryan languages (especially Urdu). It also exerted some influence on Arabic, particularly Bahrani Arabic, while borrowing much vocabulary from it under medieval Arab rule. There are approximately 110 million Persian speakers worldwide, including Persians, Tajiks, Hazaras, Caucasian Tats and Aimaqs. The term Persophone might also be used to refer to a speaker of Persian. Persian is a member of the Western Iranian group of the Iranian languages, which make up a branch of the Indo-European languages in their Indo-Iranian subdivision. The Western Iranian languages themselves are divided into two subgroups: Southwestern Iranian languages, of which Persian is the most widely spoken, and Northwestern Iranian languages, of which Kurdish is the most widely spoken. The term Persian is an English derivation of Latin Persiānus, the adjectival form of Persia, itself deriving from Greek Persís (Περσίς), a Hellenized form of Old Persian Pārsa (????), which means 'Persia' (a region in southwestern Iran, corresponding to modern-day Fars). According to the Oxford English Dictionary, the term Persian as a language name is first attested in English in the mid-16th century. Farsi, which is the Persian word for the Persian language, has also been used widely in English in recent decades, more commonly to refer to the standard Persian of Iran. However, the name Persian is still more widely used. The Academy of Persian Language and Literature has called for avoiding the use of the endonym Farsi in foreign languages and has maintained that Persian is the appropriate designation of the language in English, as it has the longer tradition in western languages and better expresses the role of the language as a mark of cultural and national continuity. Eminent Iranian historian and linguist Ehsan Yarshater, founder of Encyclopædia Iranica and the Center for Iranian Studies at Columbia University, mentions the same concern in an academic journal on Iranology, rejecting the use of Farsi in foreign languages.