Micropolitan (statistical area)
Of course I'm familiar with the concept of a "metropolitan statistical area", defined by Wikipedia as "a geographical region with a relatively high population density at its core and close economic ties throughout the area". The United States Office of Management and Budget is responsible for the official list, which comprises 388 MSAs in the U.S. and Puerto Rico.
What I didn't know, until I learned it this morning while following up on the Beaver Dam Grammar Brawl, is that there are also 536 "micropolitan statistical areas". Since micropolitan has the same initial letter as metropolitan, an acronymic conflict arises, which has been resolved by using the Greek letter mu for "micro", so that there are MSAs and μSAs.
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