How about an Interesting as HECK thread???

[ArMaP]

The X in Xmas is NOT an abbreviation. It comes from the Greek letter Chi (X) and actually stands for Christ!

Well, X is used as an abbreviation of Χριστός (Khrīstos in Roman letters), so it is really an abbreviation.

In fact, "Christmas" is also an abbreviation, as the original names was "Christ's Mass".