I did google it. I’m guessing it was the U.S. Army’s name for it or something but nothing came up.
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If I remember correctly, a lot of US planes in game have alternate designations because the companies that made some of them still have copyright on the names of the planes, so the devs did it to avoid legal trouble with said companies.
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but war thunder has the right names?
For whatever reason, yes. Not really sure why though.
Here’s an SS of the correctly named F4U family in the War Thunder wiki

has to be one of the worst abbreviation to use on a WW2 themed forum.