Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym NPN is...

NPN is

Negation, Permutation, Negation

More Meanings For NPN:

Negative-Positive-Negative transistor
No Problem Network
Negative-Positive-Negative transistor
Negation, Permutation, Negation
Nature Photographers Network
Neighborhood Parent Network
No Purchase Necessary
No Point Necessary
No Purchase Needed
No Purchase Ness
Non Protein Nitrogen
No Purchase Nessecary
NASA Part Number
National Petroleum News
National Poultry News

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