"A" and "An", a silly question...

AN exception is number of words starting the letter "U". I know it's weird, but it's standard American English: it isn't supposed to make sense.
 
Not a silly question . . .

I like to consult a style guide when these come up on rare occasion, and my preference is the Chicago Manual of Style (14th Edition), and Section 6.60 says this (my coloring):

A and An
6.60 Such forms as "an historical study" or "an union" are not idiomatic in American English. Before a pronounced h, long u (or eu), and such a word as one, the indefinite article should be a:

a hotel
a historical society
a euphonious word
such a one
a union

but...
an honor
an heir


(Oh, and for those that don't speak or write American English, y'all talk funny anyway, so it ain't gonna matter. :p ).


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