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Golfing Technique                     Inventor           Year
-----------------                     --------           ----
...
--$| magical flip-flop                The Hospel         2002
\$h{X} is one less than ++$h{X}
       aka Thelen's Device            The Thelen         2002

-=! and -=!!        - flathead
+=! and +=!!        - phillips
...

$x x=!! $y  is same as $x = '' unless $y;
$x x=!  $y       --    $x = '' if $y;

Operator     Nickname                Function
================================================
...
+=!   +=!!   Phillips
x=!   x=!!   Pozidriv
*=!   *=!!   Torx

Constant     Nickname                Value
=================================================
<=><=><=>    Space fleet             0
<~>          Amphisbaena             $ENV{HOME}

/[3-9]/||print"@{[world,hello,'world!']}[/./g]
"for 0..$$