| IWB | indeterminate [HIV-1] Western blot; index of well being |
|---|---|
| L&W, L/W | living and well |
| mb | millibar; mix well [Lat. misce bene] |
| NB | nail bed; neuro-Behc;cet [syndrome]; neuroblastoma; neurometric battery; newborn; nitrous oxide-barb... |
| nb | newborn; note well [Lat. nota bene] |