$INPUT_LINE_NUMBER
$OUTPUT_FIELD_SEPARATOR
$^C The current value of the flag associated with the -c switch. Mainly of use with -MO=... to allow code to alter its behavior
$^H WARNING: This variable is strictly for internal use only. Its availability, behavior, and contents are subject to change without notice
$OLD_PERL_VERSION
@+ This array holds the offsets of the ends of the last successful submatches in the currently active dynamic scope.
%SIG The hash %SIG contains signal handlers for signals. For example:
${^PREMATCH} This is similar to $` ($PREMATCH) except that it does not incur the performance
$INPUT_RECORD_SEPARATOR
$FORMAT_TOP_NAME
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