Definition : named it X-radiation to signify an unknown type of radiation (X represents the “unknown” in math)
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What does X-ray mean?

X-radiation (X-rays) is a form of electromagnetic radiation. X-rays were discovered in 1895 by Wilhelm Conrad Röntgen, who named the new form of radiation X-radiation (X standing for “Unknown”). X-radiation is called Röntgen radiation, after Wilhelm Röntgen.