eli5 Why, in English Grammer, is it always an “an” before an acronym? Even if the acronym doesn’t start with a vowel?

Question

eli5 Why, in English Grammer, is it always an “an” before an acronym? Even if the acronym doesn’t start with a vowel?

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Answer 1

It isn’t. Just like everywhere else in the English language it’s not the following letter that matters but the following sound. MIT is pronounced “am i tee” so it’s “an MIT”. VAT is pronounced “vee ay tee” so it’s “a VAT”