Hiện nay

1. New Brunswick
2. Narrow Band - also N/B
3. No-Bias
4. Narrow Beam
5. Neutral Buoyancy
6. Noisy Bus
7. Navigation Base
8. Nitrogen Base
9. Northbound - also NBND
10. Conrail - also BA, BCK, BE, BWC, CASO, CIND, CNJ, CNMZ, CR, CRCX, CRE, CRI, DLW, EL, ERIE, IRN, LWV, MC, MHM, NH, NIAJ, NYC, NYLB, PAE, PAUT, PC, PCA, PCB, PE, PLE, PRR, RDG, RR, TOC, TPT, WAW and WHN
11. Nanobacteria
12. Narrowband
13. Nail bed
14. Nanobarn
15. Nasal bone
16. Nitrogen Balance - also Nbal
17. Novobiocin - also NOV, NVB and novo
18. Neuroblastoma - also nbs, NBL and NRB
19. Noble - also NBL and N
20. Nitrosobenzene - also NOB
21. Neuromedin B - also NMB
22. Nippostrongylus brasiliensis - also Nbr