le These operators are documented in perlop.
NAME
Bitwise And Binary "&" returns its operands ANDed together bit by bit. Although no warning
$< The real uid of this process. You can change both the real uid and the effective uid at the same time by using
${^UTF8CACHE} This variable controls the state of the internal UTF-8 offset caching code. 1 for on (the default), 0 for off, -1 to debug the
$^E Error information specific to the current operating system. At the moment, this differs from $!
$* $* was a variable that you could use to enable multiline matching. After a deprecation
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