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

From Twitter's rebranding to The X-Files to algebra, this single letter has an uncommon amount ofX factor. A historian of mathematics gets to the root of it.

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

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Don't annex the X!

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Red X With Circle Images – Browse 25,332 Stock Photos, Vectors, and Video

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Can you debug these 3D shapes?

2,710 Shiny Red Letter X Images, Stock Photos, 3D objects