TRIVIAL PURSUITS: Why are X-rays called X-rays?

Why are the rays that send these particles called “X-rays?”

The X-ray was discovered in 1895 by a German Professor of physics at the University of Wurzburg in Germany, Wilhelm Konrad Roentgen. He did not understand the nature of these rays.

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In mathematics, “x” represents an unknown quantity. Roentgen called the rays X-rays, representing that which had not yet been explained by science.

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