| item | description | category | filter | more on... |
| NPN | NASA Part Number | Governmental/NASA |
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| NPN | National Prevention Network | Non-Profit Organizations |
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| NPN | Negation, Permutation, Negation | Edu./Mathematics |
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| NPN | Negative Positive Negative | Edu./Electronics |
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| NPN | Negative-Positive-Negative | Uncategorized |
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| NPN | No Problem Network | IT/Networking |
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| NPN | No Purchase Nessecary | Business/General |
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| NPN | Non Protein Nitrogen | Medical/Human Genome |
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