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

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

What's So Fascinating About the Letter X?

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

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

What does the letter 'X' mean? Branding experts weigh in

The historical love letter John Hancock President of Congress

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X marks the unknown in algebra – but X's origins are a math mystery

Decodyne Math Wall Clock - Unique Wall Clock - Each Hour Marked by a Simple Math Equation : Home & Kitchen