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 sign ⟨&⟩ is read as "and" in English and the original Latin et is now no longer obvious. Under the early third-century BCE Parthian Empire, whose government used Koine Greek but whose native language was Parthian, the Parthian language and the Aramaic-derived writing system used for Parthian both gained prestige.