I believe you have a hash-of-arrays. If you want to get at the individual array elements, you need to dereference the arrays: 
use warnings;
use strict;

my %symbol_list_hash = (
          'I2' => [
                    'VSS',
                    'VSS',
                    'Rep_en',
                    'ENb',
                    'VDD',
                    'VDD'
                  ],
          'I9' => [
                    'Vctrl',
                    'ENq',
                    'net014',
                    'Vb_CS_LNA',
                    'VDD_OpAmp',
                    'VSS'
                  ],
          'I3' => [
                    'VSS',
                    'VSS',
                    'ENb',
                    'ENq',
                    'VDD',
                    'VDD'
                  ]
);

for my $aref (values %symbol_list_hash) {
    my @arr = @{ $aref };
    print "$_\n" for @arr; # do someting with each element
}

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See also:

In reply to Re: manipulation to hash by toolic
in thread manipulation to hash by menylea

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