In Monday's puzzle, 27-Across read [Greek letter X], which was either a gimme or a "Now, which one is that again..?" for most solvers. CHI it was, but it is tough to keep track sometimes. Four of ...

In algebra, we’re often asked to solve for x, and, in the English language, the letter x is often used to signify the unknown—X marks the spot, X-rays, and Mr. X, for example. But how did this ...

The British news site added that though some might find the new tat grave, it’s actually the Greek letter “Chi” -- which means Christ.