Gradian

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

In trigonometry, the gradian – also known as the gon (from Ancient Greek γωνία (gōnía) 'angle'), grad, or grade – is a unit of measurement of an angle, defined as one-hundredth of the right angle; in other words, 100 gradians is equal to 90 degrees.

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

Image: Wikinger from en.wiki, CC BY-SA 3.0, via Wikimedia Commons.