You are viewing the version of this documentation from Perl blead. This is the main development branch of Perl. (git commit 5355a72c746fa5146541d790aece53b22737afee)
${^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.