Traditionally the term has been mostly about speed rather than density. Well, a lot of people say it's about transistors per chip since Moore wrote a paper on

Traditionally the term has been mostly about speed rather than density. Well, a lot of people say it's about transistors per chip since Moore wrote a paper on that doubling and that was the first time people noticed periodic doubling in the semiconductor industry. But it took almost 10 years for "Moore's Law" to come into currency and in the mean time Moore had made lots of speeches about lots of different doubling. And the term "Moore's Law" has never really referred to one aspect of semiconductor technology in particular since during the era of Dennard scaling they all improved together.