The Mesopotamian bull-man is a demon. He is a man above the waist and a bull below the waist. He also has the horns and the ears of a bull.
The Bull man helps people fight evil and chaos. He holds the gates of dawn open for the sun god Shamash and supports the sun disc. He is often shown on Cylinder Seals. Shamash in his trone from the tablette of Sippar ca. ...
It appears frequently in Mesopotamian art, sometimes with wings. Statues of the bull-man were often used as gatekeepers. Over time it evolved into a friendly, protective demon.
In Akkadian, he is called Gud-elim "The Horned Bull"