I think you're looking for "enumeration":

use enum qw(Sun Mon Tue Wed Thu Fri Sat);

my @reminders;
$reminders[Sat] = 'Brunch with Jenny.';
$reminders[Sun] = 'Read paper.';
$reminders[Mon] = 'Despair.';
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Of course you can do this without the enum module too. You can even just use variables ($Sun, $Mon, etc.) for them.