What does FIV stand for?

Federation Internationale de la Vieillesse - International Federation on Ageing - IFA (EAIO)

Feline Immunodeficiency Virus

Fellow of the Institute of Valuers - British

Fiberglass Innovations, Grove City, FL - Manufacturer code for watercraft hull identification number (USCG)

Fitness Institute of Victoria - Australia

Forced Inspiratory Volume (MELL)

Fuel Insolation Valves (MCD)

Future Infantry Vehicle - Army

Interface Group, Inc. - ICAO designator (FAAC)