"Unexplained Phenomina" is a term used by The Panopticon to reffer to any sort of supernatural or paranormal activity, that cannot be explained by currently known means. It is a broad category, with several sub-classifications such as the PRE system.
While it is mainly used as an umbrella term, it is occationally used to reffer to any beings that seem to be on of a kind.
Ophiuchus: "Star born"
JOKER : Unknown
Charlotte : "Cheshire Shard"