| NAS-NRC | National Academy of Science-National Research Council |
|---|---|
| NIRNS | National Institute for Research in Nuclear Science |
| NS | natural science; Neosporin; nephrosclerosis; nephrotic syndrome; nervous system; neurological surger... |
| NSF | National Science Foundation; nodular subepidermal fibrosis |
| OST | object sorting test; Office of Science and Technology |