Well, a reference to an array is a scalar. So, perhaps something like:

my @foo = qw/1 2 3 4 5 6/;
my %bar = (
        \@foo => 'elephants',
        );

my $zonk = \@foo;

print "$bar{$zonk}\n";
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elephants
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Cheers,
Darren :)

The problem with your suggestion is that two arrays with the same elements will give two entries in the hash (because they will have different references). Consider:

use strict;
use warnings;
use Data::Dumper;

my @foo = qw/1 2 3 4 5 6/;
my @fu  = qw/1 2 3 4 5 6/;
my %bar = (
           \@foo => 'elephants',
           \@fu  => 'zebras'
        );

print Dumper \%bar;
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Outputs something like:

$VAR1 = {
          'ARRAY(0x18ae770)' => 'zebras',
          'ARRAY(0x17f0ec8)' => 'elephants'
        };
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And:

my @foo = qw/1 2 3 4 5 6/;
my @fu  = qw/1 2 3 4 5 6/;
my %bar = (
           join ('',@foo) => 'elephants',
           join ('',@fu)  => 'zebras'
        );

print Dumper \%bar;
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Outputs:

$VAR1 = {
          '123456' => 'zebras'
        };
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citromatik

A reference to another array with the same sequence of integers should point to the same hash entry.