An auto-regeneration unit was a Borg device. It was spherical in shape and could crawl around on its own autonomously even after its ship was destroyed.

An object suspected to be a functional auto-regeneration unit was among the technology salvaged from the debris of a Borg probe destroyed by the USS Voyager in 2375. Captain Kathryn Janeway initially mistook it for a transwarp coil, until Harry Kim warned her not to touch it. (VOY: "Dark Frontier")

The same prop was also used in the season 5 episode "Thirty Days".

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