The letter X in "Xmas" is actually the Greek letter "Chi", which is the Greek abbreviation of the word "Christ".

In Plato's Timaeus, it is explained that the two bands that form the soul of the world cross each other like the letter Χ.Chi or X is often used to abbreviate the name Christ, as in the holiday Christmas (Xmas). When fused within a single typespace with the Greek letter Rho, it is called the labarum and used to represent the person of Jesus Christ.
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