Acronym that means first in, first out. It is a queuing system in which the next item to be acquired is the oldest item (or first item) in the queue.

Symbol used in the diagnostic code book titled International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) . It is used to indicate that a fifth digit is required for coding to indicate the highest level of specificity. Also see fourth and fifth digits .

Also called additional insurance option . See additional term insurance option .