Nanometre

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 nanometre (international spelling as used by the International Bureau of Weights and Measures; SI symbol: nm), or nanometer (American spelling), is a unit of length in the International System of Units (SI), equal to one billionth (short scale) or one thousand millionth (long scale) of a metre (0.000000001 m) and to 1000 picometres.

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

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