The cuneiform ù sign, is found in both the 14th century BC Amarna letters and the Epic of Gilgamesh. Its use is as a conjunction,, but rarely it is substituted for alphabetic u, but that vowel u is typically represented by 'u, no. 2',, ú; occasionally 'u, no. 1',, ,, is also substituted for the "alphabetic u".
(relatively ancient form of ù) Use of ù at start of Line 3-(directly below LUGAL-(king) of line 2). Early 2nd millennium BC clay tablet of King Zimri-Lim of Mari.
The cuneiform U sign is found in both the 14th century BC Amarna letters and the Epic of Gilgamesh. It can be used for the alphabetic u, instead of the more common 2nd u, (ú). It has two other uses, commonly. It can be used for the number 10, but its probable greater use is for the conjunction, u, with any of the conjunction meanings: and, but, else, etc.
Amarna letter EA 365-(Reverse), Biridiya to Pharaoh, "Furnishing Corvée Workers". Conjunction use of u in first line, a segue: "And see...!", (..."But Look!"). The entire substance of the clay tablet letter follows on (this)-reverse side (one line needed as 'final line' on an edge). (2nd use of conjunction u, and..., at start of line 8 (1st character at left.)) (high resolution, expandible photo)
Line 3, left (example) Ù (cuneiform) 3rd U: conjunction for And, but, else, etc.