The 12th letter of the Greek alphabet. See Table at alphabet.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "mu" in a sentence
"Your example of wordpress+mu is a tough one, since it is WordPressMU so the tag “should” be “wordpressmu”."
"The question I have is if this is the end of politics as we know it, or are we just being fooled by the flash and dash of MoveOn, Meetup, the blogosphere, self publishers, and the thing that got everybody in mu worlds attention, a presidential campaign that broke all sorts of records in raising money from small donors?"
"Goofy cartoons of older men and women looking tacky and dumpy (thinking stereotypical Miami) in mu mu’s and oversized sunglasses"