Examples from perlref dealing with symbolic references:

  $name = "foo";
  $$name = 1;                 # Sets $foo
  ${$name} = 2;               # Sets $foo
  ${$name x 2} = 3;           # Sets $foofoo
  $name->[0] = 4;             # Sets $foo[0]
  @$name = ();                # Clears @foo
  &$name();                   # Calls &foo() (as in Perl 4)
  $pack = "THAT";
  ${"${pack}::$name"} = 5;    # Sets $THAT::foo without eval
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