%^H The %^H hash provides the same scoping semantic as
$^O The name of the operating system under which this copy of Perl was built, as determined during the configuration process. For examples
$> The effective uid of this process. For example: $<
%ERRNO
$" When an array or an array slice is interpolated into a double-quoted string or a similar context such as /
${^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
$$ The process number of the Perl running this script. Though you can set this variable, doing so is generally discouraged, although
@- $-[0] is the offset of the start of the last successful match
$b Special package variables when using sort()
${^MATCH} This is similar to $& ($MATCH
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