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

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

Elon Musk visits Auschwitz after uproar over antisemitic messages

How Elon Musk pronounces 'X Æ A-12,' his new son's name - CNET

X n x x

The historical love letter John Hancock President of Congress

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The Letter 'X' Stands for the Unknown, the Mysterious, and the

Dear Santa: Santa letters published for 2016, News

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X Marks The Unknown In Algebra – But X's Origins Are A Math Mystery