X-ray

Definition	:	named it X-radiation to signify an unknown type of radiation, X represents the unknown in math
Category	:	Academic & Science » Physics
Country/Region	:	Worldwide
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What does X-ray mean?

X-radiation (X-ray) is a type of electromagnetic radiation that was named to signify an unknown type of radiation, where X represents the unknown in math. It is commonly used in medical imaging to produce images of the internal structures of the body.
X-rays were discovered in 1895 by the German scientist Wilhelm Conrad Röntgen, who named the new form of radiation X-radiation, X standing for Unknown.
X-radiation is also called Röntgen radiation after Wilhelm Röntgen.