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It’s an unpresupposing little letter, . In fact, that’s the reason we use it to represent something we don’t know. But how do you write it down? When Vijay Krishnan tweeted a link to an American college professor’s page on mathematical handwriting, I was shocked to learn that he thought adding a hook to a simple cross was sufficient to differentiate letter- from times-.
So I asked our Twitter followers how they write . The Cambrian explosion of diversity in answers I received was eye-opening – I’m glad I asked!
