FV

Field Vehicle [US], Fighting Vehicle [UK], FV numbering system [UK]
Found on http://www.jedsite.info/index.html

FV

fermentation vessel
Found on http://www.thehomebrewforum.co.uk/glossary.php

Fv

The variable region fragment of an antibody heavy or light chain.
Found on http://www.roitt.com/glossary.asp
No exact match found