usage of a and an
"LPVIO: An LPV system box"
"LPVIO: A LPV system box"
The rule is that is the sound after a/an is the SOUND of a vowel, then use an. Even when you read your example, you will say: "El Pee Vee" - this means that L starts with a vowel sound because it is pronounced as El. In turn, this means that you need an.
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