bash-2.03$ perl -le 'print for sort keys %::'

CYGWIN_NT-5.1                   Solaris             
==============                  ======= 
                                                              
"                               "            
$                               $            
+                               +             
-                               -             
/                               /             
0                               0             
<none>::                        <none>::      
@                               @             
ARGV                            ARGV          
CORE::                          CORE::        
Cwd::                           DB::          
DB::                            DynaLoader::  
DynaLoader::                    ENV           
ENV                             INC           
INC                             IO::          
IO::                            Internals::   
Internals::                     PerlIO::      
PerlIO::                        Regexp::      
Regexp::                        STDERR        
STDERR                          STDIN         
STDIN                           STDOUT        
STDOUT                          UNIVERSAL::   
UNIVERSAL::                     _             
Win32::                         _<-e          
Win32CORE::                     _<perlio.c       
_                               _<perlmain.c 
_<Win32CORE.c                   _<universal.c
_<cygwin.c                      _<xsutils.c  
_<perlio.c                      attributes:: 
_<perlmain.c                    main::       
_<universal.c                   stderr       
_<xsutils.c                     stdin        
attributes::                    stdout       
main::                          utf8::       
stderr                          
stdin                           
stdout                                 
utf8::