Kevin is the lead singer in a three-piece cover band called "Triple X"

You can call me X, the emigre artist you met in a kosher restaurant.

All the cell leaders are called X so as to confuse the enemy.

"Our leader is a man called X, that is all you have to know."

But this man called X, is he not glamorous?

After a moment, Warnow asked: "Have you ever heard of a man called 'X'?"

The lonely newcomer called X is simply looking for a home.

This is a song from the 10th Blue System album called X - Ten .

Could the human eye have arisen directly from something slightly different from itself, something that we may call X?