Basically, supposedly, if you take a matrix of letters from any part of one of the first 5 books of the old hebrew bible, you can find words if use letters, let's say, every 21 letters. They've done this, and found related words in matrices, such as Hitler, Holocaust, blah blah blah. Supposedly they've found the end of the world as well.

I really don't know a TON about it, but I've watched the two documentaries on The History Channel about them, and they are quite convincing.