Femtometre

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 femtometre (American spelling femtometer), symbol fm, (derived from the Danish and Norwegian word femten 'fifteen', Ancient Greek: μέτρον, romanized: metron, lit. 'unit of measurement') is a unit of length in the International System of Units (SI) equal to 10−15 metres, which means a quadrillionth of one metre.

Excerpt from the Wikipedia article “Femtometre”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: en:User:FrankH, Public domain, via Wikimedia Commons.