| FAB classification | French, American, British classification |
|---|---|
| ICD | I-cell disease; immune complex disease; implantable cardioverter defibrillator; impulse-control diso... |
| L/N | letter/numerical [system] |
| NA | Avogadro constant or number; nalidixic acid; Narcotics Anonymous; network administrator; neuraminida... |
| NRS | neurobehavioral rating scale; normal rabbit serum; normal reference serum; numerical rating scale |