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

Inside Elon Musk's 25-year history and obsession with the letter X as he prepares to rename and rebrand Twitter

Where Elon Musk's obsession with the letter X comes from

Elon Musk and the letter X, the name for his everything app : NPR

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

Elon Musk moving servers himself shows his 'maniacal sense of urgency' at X, formerly Twitter

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Why Elon Musk Is Obsessed With The Letter X And Has Been For More Than 20 Years

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

The risible origin story of Elon Musk's 'X' - New Statesman

Elon Musk's history with the letter X, from SpaceX to Tesla Model X and xAI

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Elon Musk and the letter X, the name for his everything app : NPR