than 150–200 unique signs, most of which were syllabic signs (representing syllables). Due to the limited number of signs used, Old Assyrian is relatively easier to decipher for modern researchers than later forms of the language, though the limited number of signs also means that there are in cases several possible alternative phonetic values and readings. This means that while it is easy to decipher the signs, many researchers remain uncomfortable with the language itself. Though it was a more archaic variant of the later Assyrian language, Old Assyrian also contains several words that are not attested in later periods, some being peculiar early forms of words and others being names for commercial terms or various textile and food products from Anatolia. In the Middle and Neo-Assyrian empires, the later versions of the Assyrian language were not the only versions of Akkadian used. Though Assyrian was typically used in letters, legal documents, administrative documents, and as a vernacular, Standard Babylonian was also used in an official capacity. Standard Babylonian was a highly codified version of ancient Babylonian, as used around 1500 BC, and was used as a language of high culture, for nearly all scholarly documents, literature, poetry and royal inscriptions. The culture of the Assyrian elite was strongly influenced by Babylonia in the south; in a vein similar to how Greek civilization was respected in, and influenced, ancient Rome, the Assyrians had much respect for Babylon and its ancient culture. Because of the multilingual nature of the vast empire, many loan words are attested as entering the Assyrian language during the Neo-Assyrian period. The number of surviving documents written in cuneiform grow considerably fewer in the late reign of Ashurbanipal, which suggests that the language was declining since it is probably attributable to an increased use of Aramaic, often written on perishable materials such as leather scrolls or papyrus. The ancient Assyrian language did not disappear completely until around the end of the 6th century BC, well into the subsequent post-imperial period. Aramaic and other languages Because the Assyrians never imposed their language on foreign peoples whose lands they conquered outside of the Assyrian heartland, there were no mechanisms in place to stop the spread of languages other than Akkadian. Beginning with the migrations of Arameans into Assyrian territory during the Middle Assyrian period, this lack of linguistic policies facilitated the spread of the Aramaic language. As the most