The meaning of the Acronym NPN is...

NPN is

• Non Protein Nitrogen

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

NPN is also in:

• Electronics
• General
• Hardware
• Human Genome
• Mathematics
• Media
• NASA
• Networking
• Unfiled