Ù (cuneiform)
The cuneiform ù sign ('u, no. 3'), is found in both the 14th century BC Amarna letters and the Epic of Gilgamesh. Its use is as a conjunction, (translated as for example: and, but, else, until, etc.), but rarely it is substituted for alphabetic u, but that vowel u is typically represented by 'u, no. 2', (u prime), ú; occasionally 'u, no. 1', (u (cuneiform)),
, (mostly used for a conjunction, and numeral 10), is also substituted for the "alphabetic u".
The use of ù is often as a "stand-alone" conjunction, for example between two listed items, but it is used especially as a segue in text, (example Amarna letters), when changing topics, or when inserting segue-pausing positions. In the Amarna letters, it is also commonly immediately followed by a preposition: a-na, or i-na, used as "...And, to....", or "...And, in...."; also "...But, for....", etc. This usage with a preposition is also a better example of the segue usage.
Of the three u's, by graphemic analysis (Buccellati, 1979), the commonness is as follows: