What is the global hash %_ ?

I've seen that %_ is treated as a special variable in Perl, as $_ and
@_ are: no warning is issued when using it without a package name, no
'my' is allowed on that var; the problem is that I could not find it
among Perl's documentation.

I'd like to use it in a program but am not sure whether I might be
interfering with some other intended use for %_ . Can someone point out
what is this variable exactly, and whether it is safe to use it?

.

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