The accronym "GNU" stands for Gnu Is not Unix.
Technically speaking, it's "GNU/Linux" because Linux is the kernel, not the whole thing, we just shorten it to Linux (I do this myself, but I do know that Linux is just the kernel).
It is made up of the Linux kernel and several GNU programs (try typing a basic command into a terminal with --help, chances are you could easily find one that says GNU somewhere at the bottom).
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