Roentgen

Rarity: Rare

A topic known well beyond its field, found in many languages.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

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What Wikipedia says

The roentgen or röntgen (; symbol R) is a legacy unit of measurement for the exposure of X-rays and gamma rays, and is defined as the electric charge freed by such radiation in a specified volume of air divided by the mass of that air (statcoulomb per kilogram).

Excerpt from the Wikipedia article “Roentgen (unit)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Wusel007, CC BY-SA 3.0, via Wikimedia Commons.