The cuneiform sign ú is a common-use sign of the Amarna letters, the Epic of Gilgamesh, and other cuneiform texts (for example Hittite texts). It has a secondary sub-use in the Epic of Gilgamesh for šam.
Linguistically, it has the alphabetical usage in texts for u, but can replace any of the four vowels, so also used for a, or e, or i.
The ú sign usage in the Epic of Gilgamesh is as follows: (šam, 45 times, ú, 493, KÚŠ, 2, and Ú, 4 times).[1] Ú is logogram, for Akkadian "tullal", a soapwort.
The following words use the syllabic šam as the first syllable in the word entries under š in the glossary.[2]