Ú (cuneiform)
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.