A Brief History of the Letter 'X,' From Algebra to X-Mas to Elon Musk, History

A math historian explores how "x" came to stand in for an unknown quantity

Elon Musk - Wikipedia

Musk's fascination with the letter 'X' - The Atlantic

Why Transformations Need To Make Sense: Lessons From Elon Musk's 'X

A brief biography of 'X,' the letter that Elon Musk has plastered everywhere

A brief biography of 'X,' the letter that Elon Musk has plastered everywhere

Explained Why is Elon Musk so obsessed with the letter 'X'? - Technology News

Here's the History of Elon Musk's X Brands

What Does X Mean to Elon Musk? - The New York Times

Opinion Elon Musk rebrands with the letter X. Why? - The Washington Post