The name of the mythological being usually called Anzû was actually written in the oldest Sumerian cuneiform texts as 𒀭𒉎𒈪𒄷 (AN.IM.MIMUŠEN; the cuneiform sign 𒄷, or MUŠEN, in context is an ideogram for "bird"). In texts of the Old Babylonian period, the name is more often found as 𒀭𒉎𒂂𒄷 AN.IM.DUGUDMUŠEN.[2] In 1961, Landsberger argued that this name should be read as "Anzu", and most researchers have followed suit. In 1989, Thokild Jacobsen noted that the original reading of the cuneiform signs as written (giving the name "dIM.dugud") is also valid, and was probably the original pronunciation of the name, with Anzu derived from an early phonetic variant.