blah
sigh... "plain variables" are "named variables".
$var = "Hello world!"; # \
@ary = qw(foo bar baz); # - plain
%hash = qw(foo 1 bar 2 baz 3); # /
$sref = \$var; # \
$aref = \@ary; # - references
$href = \%hash; # /
References which aren't references of plain (or named) variables are anonymous.
E.g. we speak of $ary = [] as of an anonymous array which happens to be stored in the plain (or named) scalar variable $ary, be that stored in a symbol table or a pad.
perl -le'print map{pack c,($-++?1:13)+ord}split//,ESEL'
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