The Chi Rho does not belong to any one particular branch of Christianity, but is a universal Christian symbol for all.  The Chi-Rho consists of the intersection of the capital Greek letters Chi (x) and Rho (P), which are the first two letters of the word “Christ” in Greek. 

Each Sacred Symbol is created by hand, one at a time by me, more here...

This Chi-Rho is shown with the letters Alpha (A) and Omega (Ω) the first and last letters of the Greek alphabet. Jesus refers to himself: "I am the Alpha and the Omega, the First and the Last, the Beginning and the End." (Revelation 22:13).

Because each Sacred Symbol is created by hand, one at a time, there is a slight size variation among them.  They range from 10 to 12 ounces ( 284 to 340 gm) and are approximately 3.5 to 4 inches (8.9 to 10.2 cm) across.