You are viewing the version of this documentation from Perl blead. This is the main development branch of Perl. (git commit 3b8e22dce3538964a9e2872578817c4fc335d8c4)
${^UNICODE}

Reflects certain Unicode settings of Perl. See perlrun documentation for the -C switch for more information about the possible values.

This variable is set during Perl startup and is thereafter read-only.

This variable was added in Perl v5.8.2.