Cuneiform is the name of various writing systems in use throughout the Middle East from the end of the fourth millennium BCE until the late first century CE. The wedge-shaped writing was used to write ten to fifteen languages from various language families: Sumerian, Elamite, Eblaite, Old Assyrian, Old Babylonian and other Akkadian dialects, Proto-Hattic, Hittite, Luwian, Palaic, Hurrian, Urartian, Ugaritic, Old Persian etc. Over the centuries it evolved from a pictographic to a syllabographic writing system and eventually became an alphabetic script, but most languages used a 'mixed orthography' which combined ideographic and phonetic elements, and required a rebus principle of reading.