Baguenaudier

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Baguenaudier (pronounced [baɡnodje]; French for "time-waster"), also known as the Chinese rings, Cardan's suspension, Cardano's rings, Devil's needle or five pillars puzzle, is a disentanglement puzzle featuring a loop which must be disentangled from a sequence of rings on interlinked pillars.

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

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