Variable x Memes

The mathematical variable 'x' appears approximately 10,000 times per algebra textbook, while the English language contains roughly 12 words that start with 'x' - and half of those are just "xylophone" spelled incorrectly. The frequency disparity is so extreme that mathematicians had to invent their own universe where 'x' is the main character, while dictionary editors are still wondering why we even have this letter.