Mu
and 
mu
- (syl.) glyph for the syllable mu in the Kamakawi syllabary
- (n.) spiral (shape)
I mu ie lelea…
“There’s a spiral in the water…”
Notes: And we come to this one. So mu doesn’t mean anything, really. It’s just kind of a thing. In the oldest form of the writing system, it was a spiral, and so if you use it with a determiner, it means “spiral”, but in the same way that “O” means “circle” or “ring” in English (e.g. “Form an O around the pole.”). So it doesn’t really have a meaning, per se. It’s really just a shape. Kind of a neat one, though.