$^O The name of the operating system under which this copy of Perl was built, as determined during the configuration process. For examples
$OLD_PERL_VERSION
$^C The current value of the flag associated with the -c switch. Mainly of use with -MO=... to allow code to alter its behavior
NAME
__DATA__ These keywords are documented in Special
$INPLACE_EDIT
$EFFECTIVE_USER_ID
$b Special package variables when using sort()
ne These operators are documented in perlop.
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