Chi Ro sign

I also learned that what is this sign means: It is called "Chiro" sign and a combination of first two letters of word "Christ" in Greek. Chi "X" and Ro "P". The rest is in: http://en.wikipedia.org/wiki/Labarum .

Ps. This is not one of the important things to me. It is here first because I learned about it most recently before I started to write in this blog.