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

Not always – you don’t eat an BLT sandwich, you eat a BLT sandwich.

It’s because most english letters, when pronounced, start with vowel sounds. For example, N is pronounced EN, and we use an whenever the sound of the next word is a vowel sound.