Trichiliocosm

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Warning! The following section contains spoilers for aspects of MAMIYA's story. Proceed with caution.

The Trichiliocosm is referenced many times throughout the story, most often by MAMIYA right before a character's death. In its original context of Buddhist cosmology, it refers to a billion world-systems, while in MAMIYA, it is revealed to be another name for the Upper Layer's library and its endless stories.

In Buddhism

Origin & history
From tri- + chilia- + Ancient Greek κόσμος‎ ("world"), partially calquing Sanskrit त्रिसहस्रमहासहस्रलोकधातु‎ (literally "three thousand million world element").

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Noun
trichiliocosm (pl. trichiliocosms)

1. (Buddhism) A concept in cosmology of a "third-order" universe containing one thousand second-order clusters, which are made of one thousand first-order clusters, which are in turn made of a thousand worlds each. Billion-fold universe.