On Thu, Feb 12, 2009 at 02:34:37PM +0000, Dirk Koopman wrote: > Just been studying a CPAN module and I see a load of references to !0. > Er, what is that? Googling most unhelpful. It must be the prefix factorial operator. $ perl -E 'say !0' 1 $ and 1 is 0 factorial. qed. Abigail