[S99] "DarkPAN" entry

Nobody expects the Spanish Darkquisition!

S99-glossary.pod

@@ -250,6 +250,12 @@ distributions.
 An L</IRC> bot that reports when various projects have been updated. It gives
 L</karma> to those who pushed the changes to the project.
 
+=head2 DarkPAN
+
+Perl code in production use at companies that has never been uploaded to CPAN.
+As in "how will this change affect the DarkPAN", which can't be answered
+because you generally don't have access to that code.
+
 =head2 dead code
 
 Code that is never called. For example