| Abbreviation | Definition |
|---|---|
| N | Neutron |
| N2O | Nitrous Oxide |
| NA | Not Active |
| NA | Nucleic Acid |
| Na | sodium |
| Na | Sodium (Natrium) |
| NA% | Nitric Acid Percentage in Citrus Juices |
| NA2 | The chemical formula for sodium |
| NA24 | Radioactive Sodium |
| NAA | N Acetylaspartic acid |
| NAA | Naphtalic Acetic Acid |
| NAAA | N Acylethanolamine Acid Amidase |
| NAAT | Nucleic Acid Amplification Techniques |
| NAAT | Nucleic Acid Amplification Test |
| NAB | Native Acrylamide Bis |
| NAB | Nucleic Acid Builder |
| NAB | Sodium Benzoate |
| NABC | Non Acid Bathroom Cleaner |
| NAC | N Acetyl Cysteine |
| NAC | Nitric Acid Concentration |