Perl internal. package is just a special hash aka Symbol Table

symbol-table.pl

#!/usr/bin/env perl
#

use 5.010;

package Hello;

our $var = "scalar";

our @var = qw(array);

our %var = (
  hash => "hash",
);

sub var {
  "sub";
}

package main;
use Data::Dumper;

say Dumper \%Hello::;
say $Hello::var;
say $Hello::var[0];
say $Hello::var{hash};
say Hello::var();