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The Akkadian name Šamaš derives from a Semitic root šmš meaning 'sun,' and he is the direct Akkadian counterpart of the Sumerian sun deity Utu. The connection between the sun and justice was not merely poetic in Mesopotamian thought: the sun sees everything, its light makes everything visible, and what it illuminates it also reveals. Shamash was invoked in the adjudication of legal disputes, in oaths sworn before witnesses, and in the practice of divination. His role in the famous Code of Hammurabi is emblematic: the basalt stele on which the laws are inscribed shows King Hammurabi receiving the laws from Shamash, seated on his throne with rays of light emanating from his shoulders — a visual argument that the laws derive their authority from the sun god's universal seeing.

The mythology of Shamash emphasizes his daily solar journey as a moral narrative. Each morning he emerged from the Mountain of the East, traversed the sky in his chariot drawn by fire-horses, and descended into the Mountain of the West at evening. During the night he passed through the underworld, bringing light even to the dead. This nocturnal passage gave him unique authority: he was the only god who moved freely between the living and the dead worlds, seeing both. The Hymn to Shamash, composed in the first millennium BCE and surviving in several copies, is one of the most extended and sophisticated theological poems from ancient Mesopotamia. It catalogues the many different kinds of wrongdoers Shamash sees and punishes — the dishonest merchant, the corrupt judge, the man who sleeps with his neighbor's wife — with the systematic thoroughness of a legal code in verse.

In Babylonian divination practice, which was one of the most developed technical sciences of the ancient world, Shamash was the patron of extispicy — reading the omens from the organs of sacrificed animals. The liver in particular was considered a map of divine intention, and Babylonian clay liver models survive as training tools for the practitioners of this art. The sun's omniscience extended into the interpretive arts: just as sunlight revealed the visible world, so Shamash's priests could reveal the hidden structure of the future by reading the organs the sun god illuminated. The connection between light, sight, knowledge, and justice was a single continuous concept in Babylonian theological thinking.

Shamash's name is preserved in the Akkadian word for the sun (šamšu), which entered Semitic languages broadly: the Arabic word for sun is shams (شمس), the Hebrew is shemesh (שֶׁמֶׁש), and the Aramaic is shemsha. This root underlies the English proper name Samson, whose story — a solar hero betrayed and blinded, losing his power with his sight — has been interpreted as a solar myth parallel to the Shamash narratives. Whether or not that interpretation holds, the linguistic thread connecting Shamash to Arabic shams to Samson's name is genuine, and it reveals how deeply the Mesopotamian sun god's name was embedded in the Semitic linguistic world.