Athiest Christmas

Christmas, but with Χρῑστός (Khrīstós) abbreviated to Χ. One can read even more about its history here: https://en.wiktionary.org/wiki/Xmas#Etymology

Interesting to know that tidbit. Seems like maybe not the best way to call it though, as per your link: “ as of late 20th century considered disrespectful by some Christians, due to the absence of the word Christ.”