Corelet

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A corelet is the remaining headmate in an empty system after a system collapse, all other headmates going dormant, final fusion, or any other event that left them alone. Despite the name, they are not necessarily the core, core-kin, original, or pseudo-original, though it is a possibility.

A corelet is technically a singlet, but often feels little to no connection to the term, as they likely have memories of what it was like before they were by themself, and may even experience dysphoria about not currently being part of a system. If the empty system re-splits, the corelet may become a neo-core, especially if they were alone for months or years before other members split or awoke from dormancy.

Related Terms
A corelet could also call themself a singularity, as someone who feels close to the plural community, but only has a single presence within their own mind.

Rotatien systems may have several corelets as they cycle between system collapses.