${^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
$b Special package variables when using sort()
${^MATCH} This is similar to $& ($MATCH
$DEBUGGING
$INPLACE_EDIT
$MATCH
$^H WARNING: This variable is strictly for internal use only. Its availability, behavior, and contents are subject to change without notice
$OLD_PERL_VERSION
${^PREMATCH} This is similar to $` ($PREMATCH) except that it does not incur the performance
$^ The name of the current top-of-page format for the currently selected output channel. The default is the name of the filehandle with
Page 1 of 16