What is your position on the existence of the supernatural and is there any difference in terminology in between the atheists who believe in the supernatural and those who don't?

Atheism is, in my estimation, the lack of belief in supernatural agency, events and the existence of the supernatural. I realize that isn't the definition of atheism, so I wonder if there is a term for people who don't believe in any supernatural existence, not just the disbelief in deities. I am an atheist and I've imagined that atheists believe in nothing supernatural, but I've heard a number of atheists say they do believe in something mystic, albeit not any deity.

For purposes of this discussion, when I say "supernatural" I mean outside of the nature. When I say "nature" I mean Dark matter, dark energy, any other known and unknown components of nature, any possible parrallel universes and everything else that exists in the natural order.

I don't believe in anything supernatural at all. No gods, spirits, mystical forces or unseen purpose.