Enlil was not represented anthropomorphically in Mesopotamian iconography.
Instead, he was represented by a horned cap, which consisted of up to seven superimposed pairs of ox-horns.
Such crowns were an important symbol of divinity; gods had been shown wearing them ever since the third millennium BC.
The horned cap remained consistent in form and meaning from the earliest days of Sumerian prehistory up until the time of the Persian conquest and beyond.

The Sumerians had a complex numerological system, in which certain numbers were believed to hold special ritual significance.
Within this system, Enlil was associated with the number fifty, which was considered sacred to him.
Enlil was part of a triad of deities, which also included An and Enki.
These three deities together were the embodiment of all the fixed stars in the night sky.
An was identified with all the stars of the equatorial sky, Enlil with those of the northern sky, and Enki with those of the southern sky.
The path of Enlil's celestial orbit was a continuous, symmetrical circle around the north celestial pole, but those of An and Enki were believed to intersect at various points.
Enlil was associated with the constellation Boötes.
Enlil was not represented anthropomorphically in Mesopotamian iconography. Instead, he was represented by a horned cap, which consisted of up to seven superimposed pairs of ox-horns. Such crowns were an important symbol of divinity; gods had been shown wearing them ever since the third millennium BC. The horned cap remained consistent in form and meaning from the earliest days of Sumerian prehistory up until the time of the Persian conquest and beyond.
The Sumerians had a complex numerological system, in which certain numbers were believed to hold special ritual significance. Within this system, Enlil was associated with the number fifty, which was considered sacred to him. Enlil was part of a triad of deities, which also included An and Enki. These three deities together were the embodiment of all the fixed stars in the night sky. An was identified with all the stars of the equatorial sky, Enlil with those of the northern sky, and Enki with those of the southern sky. The path of Enlil's celestial orbit was a continuous, symmetrical circle around the north celestial pole, but those of An and Enki were believed to intersect at various points. Enlil was associated with the constellation Boötes.
Enlil