Will-o'-the-wisp

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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Notion

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Science and technology

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What Wikipedia says

In folklore, a will-o'-the-wisp, or will-o'-wisp (Latin: ignis fatuus, "foolish flame"), is an atmospheric ghost light seen by travellers at night, especially over bogs, swamps, or marshes.

Excerpt from the Wikipedia article “Will-o'-the-wisp”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Hermann Hendrich, Public domain, via Wikimedia Commons.