$^N The text matched by the used group most-recently closed (i.e. the group with the rightmost closing parenthesis) of the last successful

$INPLACE_EDIT

${^TAINT} Reflects if taint mode is on or off. 1 for on (the program was run with -T), 0 for off, -1 when only taint warnings are enabled

$^H WARNING: This variable is strictly for internal use only. Its availability, behavior, and contents are subject to change without notice

$> The effective uid of this process. For example: $<

$b Special package variables when using sort()

$OUTPUT_FIELD_SEPARATOR

IO::Handle->output_record_separator( EXPR )

$[ This variable stores the index of the first element in an array, and of the first character in a substring. The default is 0, but you could

%SIG The hash %SIG contains signal handlers for signals. For example: