What does NFA/SFA/UFA/MFA Means?

I know what the chars mean but in tearms of usability, what do they mean?

non full access, semi full access, unmigrated full access, migrated full access

Commonly used words by people cracking, sql dumping, combo checkers etc.. They sell these kind of accounts, Some people buys NFA's for alts.. Hacked client users Sigma and MoonX users bypass Hypixel, Mineplex anticheat and other servers too, they use NFA for alternate accounts in case they got banned.