The use of "written" Aramaic in the Achaemenid bureaucracy also precipitated the adoption of Aramaic(-derived) scripts to render a number of Middle Iranian languages. Moreover, many common words, including even pronouns, particles, numerals, and auxiliaries, continued to written as Aramaic "words" even when writing Middle Iranian languages. In time, in Iranian usage, these Aramaic "words" became disassociated from the Aramaic language and came to be understood as "signs" (i.e. logograms), much like the symbol '&' is read as "and" in English and the original Latin "et" is now no longer obvious. Under the early 3rd-century BC Parthians Arsacids, whose government used Greek but whose native language was Parthian, the Parthian language and its Aramaic-derived writing system both gained prestige. This in turn also led to the adoption of the name 'pahlavi' (< "parthawi", "of the Parthians") for that writing system. The Persian Sassanids, who succeeded the Parthian Arsacids in the mid-3rd century AD, subsequently inherited/adopted the Parthian-mediated Aramaic-derived writing system for their own Middle Iranian ethnolect as well. That particular Middle Iranian dialect, Middle Persian, i.e. the language of Persia proper, subsequently also became a prestige language. Following the conquest of the Sassanids by the Arabs in the 7th-century, the Aramaic-derived writing system was replaced by Arabic script in all but Zoroastrian usage, which continued to use the name 'pahlavi' for the Aramaic-derived writing system and went on to create the bulk of all Middle Iranian literature in that writing system.