Mu (cuneiform)
Cuneiform sign
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The cuneiform sign mu, is a common-use sign of the Amarna letters, the Epic of Gilgamesh, and other cuneiform texts (for example Hittite texts). It is also used as MU in which case it is a Sumerogram meaning "name," "year" or "life."[1]

(digitized form mu, and other meanings)

A common Amarna letter that uses cuneiform mu.
(Last cuneiform sign, line 6.)
Linguistically, it has the alphabetical usage in texts for m, or u, or syllabically for mu. The u is replaceable in word formation by any of the 4 vowels: a, e, i, or u.
One reason for the high usage of mu in the Amarna letters is for the word: "peace", or "be safe", Akkadian language šalāmu,[2] for "to be sound, whole, safe". It is used especially between the Great King letters.
Epic of Gilgamesh usage
The mu sign usage in the Epic of Gilgamesh is as follows: mu-(266 times); MU-(87).[3]