maybe its The X factor...that is a talent show for singing....just like idol but not always solo, it could be duo or groups...and one of the judges is Simon Cowell... or maybe "X" factor is something factor inside you...that makes you diffirent than the others..

X stands for the unknown, just like in mathematics. People are showing their "hidden" talents in the show.

"X" is sometimes used to indicate the undefinable, and is the fist letter of choice in algebra. For example, if I wanted to give an example of asking for someone on the phone, instead of making up a surname, I could call that imaginary person "X". "May I speak to X, please?" "Brand X" also means an unknown product. For "X factor", you can normally work out a person's appeal from obvious factors: personality, appearance, voice, behaviour, taste in clothes, etc. But sometimes there is an unexplainable factor why you find this person attractive or charming, or why they are far more attractive than other people who are equally amiable, good-looking, well-spoken, mannered, tasteful etc. This is called the X factor. The catchphrase in the entertainment industry about the X factor is, "you either have it, or you don't."

The X Factor is a British television singing competition contested by aspiring singers drawn from public auditions. Also, X-Factor means the unknown factor or the unexplainable thing which adds a certain value to that object, element or a person.

I think (X) means extreme