What is that famous Iron Maiden song called, duh duh duhduhduh...?

I was wondering the name of it, Its something people are always humming but I can't figure out which song it is. Help?

It's not Iron Maiden, it's called Iron Man and it's by Black Sabbath.

first off it is not maiden it is black sabbath and it is iron man.

Flaming Sword +1

Well, when you said Iron Maiden and then "duh duh duhduhduh...." I immediately thought of "Run To The Hills", from the "Number of the Beast" Album.