Random FactsCuriousOneDecember 17, 2016abbreviation, Actually, Christ, fact, facts, Greek, letter, staycurious, which, Word, XmasComment The letter X in "Xmas" is actually the Greek letter "Chi", which is the Greek abbreviation of the word "Christ". Random FactsCuriousOneDecember 17, 2016abbreviation, Actually, Christ, fact, facts, Greek, letter, staycurious, which, Word, XmasComment