Is is an acronym that means:
C = Carrier
V = Vessel
N = Nuclear
Actually, it's not technically an acronym. The U.S. navy assigns letter designations to different types of ships, which nominally have some reference to the description of that class, but they're not acronyms. Prefix and suffix letters are then added which indicate special characteristics - e.g. the suffix "G" usually means "Guided Missile", while the suffix "N" refers to nuclear propulsion, with the prefix "X" being assigned to experimental or prototype vessels.
For example, the U.S. Navy designation for Destroyers is "DD", while the old system used two different designations for Cruiser: CA (nominally from "Cruiser, Armored") for Heavy Cruiser, and CL (nominally, "Cruiser, Light").
So, "CVN" indicates an aircraft carrier (designation "CV") that has nuclear propulsion (suffix "N").
Note that the U.S. Navy has changed the designation system several times in the past 150 years, so the exact meaning of a designation depends on the time period when the ship was in use (as, a ship may change designation several times over its career).
The term "NAR" doesn't refer to a Navy ship - it's the standard Navy acronym for Naval Air Reserve.
Could mean, United States Ship (USS). Example of use; USS Saratoga (a US Navy Ship).
The USS Constitution is the oldest comissioned ship in the US Navy. The USS Constitution is "Old Ironsides" and is the oldest ship still commissioned by the U.S. Navy.
An SH is a Ship's Serviceman (Barbers, Shopkeepers, etc.). An SHCS is a Senior Chief (E-8) Ship's Serviceman (read Ship's Serviceman Chief Senior).
I haven't heard that term when relating to the US Navy. But in the Royal Navy SDG is a scubadiver
The aircraft carrier Theodore Roosevelt (CVN-71) Link below:
The CV indicates an Aircraft Carrier. The A at the end indicates it is designed for Attack use. The US Navy does not currently have any CVAs.
United States.
There is no US Navy ship specifically named after a famous mathematician. However, the USS Carl Vinson (CVN-70) is named after Carl Vinson, a prominent Georgia congressman who advocated for a strong national defense, including support for scientific research and development.
The term "NAR" doesn't refer to a Navy ship - it's the standard Navy acronym for Naval Air Reserve.
Landing Helicopter Assault
Could mean, United States Ship (USS). Example of use; USS Saratoga (a US Navy Ship).
A large US Navy ship.
The US Navy Ship that was used in the movie Behind Enemy Lines was the USS Carl Vinson (CVN 70). This super carrier was named after Carl Vinson, who was a Democratic US Representative from Georgia in Congress. The USS Carl Vinson has been seen in other movies such as Top Gun and Stealth.
The USS Nimitz (CVN-68) is the largest supercarrier in the world, belonging to the US Navy. It is 1,092 feet long.
The USS Constitution is the oldest comissioned ship in the US Navy. The USS Constitution is "Old Ironsides" and is the oldest ship still commissioned by the U.S. Navy.
Navy ships are designated as USS for United States Ship. They also receive a designation that tells you more about the ship. DD stands for Destroyer.