perl> %hash = 1 .. 10;;
perl> print "%hash";;
%hash

perl> print "@{[ %hash ]}";;
1 2 3 4 7 8 9 10 5 6

##</code><code>##

perl> use constant X => 12345;;
perl> print X;;
12345

perl> print "${ \ X }";;
12345

perl> print "@{[ X ]}";;
12345

perl> print 'stuff ' . X .' other stuff';;
stuff 12345 other stuff

perl> printf "stuff %s other stuff\n", X;;
stuff 12345 other stuff

##</code><code>##

perl> *X = sub{ 12345 };;
perl> *X = \12345;;
perl> print X;;
12345

perl> print "${X}";;
12345

perl> print "$X";;
12345