I don't know what your acronyms mean.
Lol, sorry. In this case I don't think they are acronyms. "WOTAC" is the scope model of the Wonder Optics group buy a few years ago. Decent scope, but ****ty company that's now out of business rendering the lifetime warranty worthless.
"FVSR" is just the model of my Savage bolt action .22 currently wearing the aforementioned scope.
And "AR" stands for "Armalite Rifle" model 15.