| Abbreviation | Definition |
|---|---|
| MY | Man Year |
| MY | Megalithic Yard |
| MY | Million Years |
| MYA | Millions Of Years Ago |
| n | Nano- |
| N | Newtons |
| N·M | Newton Meter |
| N·MM | Newton Millimeter |
| NAWI | Non-automatic Weighing Instruments |
| NAZI | Nearing Almost Zero Inches |
| NCM | Newton Centimeter |
| NCMH | Normal Cubic Meter per Hour |
| NED | Normal Equivalent Deviation |
| NF | Nano Farad |
| NG | NanoGram |
| NG/ML | Nanograms per Milliliter |
| nH | Nano-Henry |
| NHP | Nominal Horse Power |
| Nil | Nothing |
| nL | NanoLiter |