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

How did the letter x get its enduring role as a symbol of the unknown? A mathematician explains why it’s hard to say for sure.

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Diary outline for Math 152H, fall 2009: second section

Who created the alphabet? A historian describes the millennia-long

いかに人類は「未知なるもの＝X」と表現するようになったのか？

Knowledge of self': How a key phrase from Islam became a pillar of

X marks the unknown in algebra – but its origins are truly a math mystery - Study Finds

Diary outline for Math 152H, fall 2009: second section

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Why was there a need for someone to come up with using x's and y's to get an answer? - Quora

How Did X Become the Edgiest Letter?

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