Well, if you're a candidate for office an X on your ballot would be good! Of course, if you give a test answer an X would be bad. Then there's the St. Andrews cross X. It was bad for St. Andrew when he was crucified, but good for St. Andrews' legacy. There's the X in Xray when they didn't really know what to call it. Some people consider an X as in marriage partner or boy/girl friend a good thing or a bad thing. Then again, if you're a pirate finding the X would get you a treasure. So... I guess the jury is out on this.