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This question already has an answer here:

Which one is the correct form in written English? I am leaning towards "an NLP", since "N" starts with "e" but not sure.

marked as duplicate by Edwin Ashworth, sumelic, choster, Laurel, AmE speaker Oct 24 '17 at 1:23

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The choice between a and an always depends purely on the pronunciation of the following word, not on anything else. Hence a universal understanding. It doesn't depend on the spelling of the following word, which begins with a u, nor does it depend on the head noun understanding.

If you expect your readers to say "en el pee", then Yes, an is appropriate.

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