=over

=item chr NUMBER

=item chr

Returns the character represented by that NUMBER in the character set.
For example, C<chr(65)> is C<"A"> in either ASCII or Unicode, and
chr(0x263a) is a Unicode smiley face.  Note that characters from 127
to 255 (inclusive) are by default not encoded in Unicode for backward
compatibility reasons (but see L<encoding>).

For the reverse, use L</ord>.
See L<perlunicode> and L<encoding> for more about Unicode.

If NUMBER is omitted, uses C<$_>.

=back