Where did E* come up with the model numbers on their receivers?

Why is a HD DUO called a 222?

But an SD Duo is called a 322?

Why is a 622 HD DVR Duo called a 622?

But an SD DVR Duo is called a 625?

And so on .

Do the Numbers have meaning at all?

How about VIP? What Very important person?

I don't get the random model numbers.

and What the hell does the K stand for?