What does the 'X' in the term 'X-ray' originally stand for, as named by its discoverer Wilhelm Röntgen?
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Röntgen used the mathematical symbol 'X' because the nature of these rays was completely unknown to him at the time of his discovery. Even though scientists later understood what they were, the mysterious name stuck around. Photo: NickSpiker, Wikimedia Commons, CC BY-SA 4.0.
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Source: Wikipedia (CC BY-SA)
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