X, n.All

Christmas' "x" in the abbreviation Xmas comes from the fact that "X" in Greek is the first letter of the word Christos, or Christ.

X is a needless letter which has an added invincibility to the attacks of the spelling reformers.

X is the folding chair of the alphabet.

X is the signature of a happy man.

X is the corset of the alphabet.

X is an “H” that tried to give itself a high-five but missed.

X is a letter tha has more uses in math than in the English language.

X is just "Y" with its legs spread apart.

X is a letter used so rarely in English that it’s a good thing mathematicians exist to keep it from getting lonely.