Christian Six-pointed Star

David J. Ross  in his article [titled: The Bird, The Cross, And The Emperor] quoted Trexler as saying that before Constantine the most common star of the Magi was the six-pointed star; sometimes with the Greek letters iota and chi, which are the first letters in the Greek word for “Jesus” and “Christ.” After 312, the star had been replaced by the chi and rho, the first two Greek letters of the word “Christ".