Why don't we have two nulls?

Question

I\'ve often wondered why languages with a null representing \"no value\" don\'t differentiate between the passive \"I don\'t know what the value is\"

Answer 1

Some people will argue that we should be rid of null altogether, which seems fairly valid. After all, why stop at two nulls? Why not three or four and so on, each representing a "no value" state?

Imagine this, with refused, null, invalid:

var apple;

while (apple is refused)
{
    askForApple();
}

if (apple is null)
{
    sulk();
}
else if(apple is invalid)
{
    discard();
}
else
{
    eatApple(apple);
}