an></i>

<i><span style='color:#898887;'>// `sym denotes a `symbol' named `sym -- a constant object which is equal (==) only to itself</span></i>
<i><span style='color:#898887;'>// Symbols may also be declared with the `symbol' directive.</span></i>

<b><span style='color:#000000;'>symbol</span></b> mysym;

print (mysym == <span style='color:#ff00ff;'>`mysym</span>); <i><span style='color:#898887;'>// prints false</span></i>

<i><span style='color:#898887;'>// Actually, (x, y), (x :: y) and (cons x y) are a