=over =item $SUBSCRIPT_SEPARATOR =item $SUBSEP =item $; X<$;> X<$SUBSEP> X The subscript separator for multidimensional array emulation. If you refer to a hash element as $foo{$a,$b,$c} it really means $foo{join($;, $a, $b, $c)} But don't put @foo{$a,$b,$c} # a slice--note the @ which means ($foo{$a},$foo{$b},$foo{$c}) Default is "\034", the same as SUBSEP in B. If your keys contain binary data there might not be any safe value for C<$;>. (Mnemonic: comma (the syntactic subscript separator) is a semi-semicolon. Yeah, I know, it's pretty lame, but C<$,> is already taken for something more important.) Consider using "real" multidimensional arrays as described in L. =back