Mu (cuneiform)
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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."
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, for "to be sound, whole, safe". It is used especially between the Great King letters.