what does x in christmas mean

"X" in Christmas stands for the Greek letter "Chi" which is the first letter of the word "Christos" which means "Christ" in Greek. So, "X" represents the concept of Christ's birth and the Christian faith. It's also a symbol of God's love and mercy. That's why you'll often see "X" in various forms during the Christmas season, from "Xmas" to "X-cross" to "Xmas Tree."