How did X come to mean

A truly X-cellent and X-ceptional video…
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Despite being one of the rarest letters in English, the letter X is everywhere. We sign letters with it, we rate movies with it, we name all sorts of things after it. We’re kind of obsessed with it. And that’s probably all thanks to math, where X stands for the unknown. Let's explore the bizarre history of how X took on this role…

References: https://sites.google.com/view/....why-are-we-so-obsess

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