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3 planets orbiting a common barycentre would be very cool. I think something like that was mentioned in the Peter F Hamilton "Night's Dawn" trilogy of sci-fi books.

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Larry Niven's Known Space features a series of planets orbiting a common center like that; it's a grand engineer project, and a lifeboat of sorts.

A pentagonal form of a Klemperer rosette (first thing I thought of also): https://en.wikipedia.org/wiki/Klemperer_rosette

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