What does the 'V' represent in the abbreviation of American Aircraft Carriers, e.g. CVN 65 is the Enterprise?

CV is the designation for Aircraft Carrier, the N stands for Nuclear.
CV originally meant aViation Cruiser because CA was being used for Armoured Cruiser and was later kept for heAvy Cruiser. V was the designation for a heavier-than-air (fixed wing) unit, as in the airplane designations VA, VB, VC and VP, and so the aircraft carrier was christened CV.

What do the initials CVN stand for in the ship's name?

CVN is ther ship's "hull classification symbol" while 76 is the hull number. "C" means aircraft carrier, "V" indicates fixed wing (vice rotating wings as on helicopters), and "N" stands for nuclear powered. So CVN means (in Navy-speak) "aircraft carrier, fixed wing, nuclear powered".

https://www.quora.com/What-does-CVN-stand-for