Micro Cosmos

Micro Cosmos (瓶詰工場 (マイクロコスモス) ) is a mysterious term referenced by Kumokawa Seria in the 7th volume of Shinyaku Toaru Majutsu no Index.

Principles
After Seria believed she defeated Tsuchimikado Motoharu after he took out her eye, she requests Kaizumi Tsugutoshi to prepare the parts of her divided into the Micro Cosmos. This indicates that it contains fresh body parts of hers, and the reason why Seria was unperturbed by Motoharu plucking her eye out. Eight hours later after the events of the novel, Seria had a successful eye transplant and had already gotten used to it that she doesn't feel like there is something in her eye anymore.

With how the kanji may mean "Bottling Plant", Micro Cosmos is most likely a facility or a system that keeps spare body parts, though this just plain speculation.