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We all know Safe, Euclid, and Keter. A lot of us even know the lesser known Thaumiel, and Apollyon. Now for the ones that are a lot less known

Archon which are “anomalies that could theoretically be contained but are best left uncontained for some reason”

we also have Ticonderoga “SCPs cannot be contained, but also do not need to be contained.”

The last ones I will cover are Non-Standard Object Classes

Explained this one is pretty self explanatory “anomalies that are completely and fully understood, to the point where their effects are now explainable by mainstream science, or phenomena that have been debunked or falsely mistaken as an anomaly.” there’s a special page for these and these are some of my favorite non Non-Standard Object Classes

Neutralized “SCPs are former anomalies that are no longer anomalous, either through having been intentionally or accidentally destroyed or disabled.” A good mix in this one a really notable heart breaking one Here be dragons

Decommissioned “SCPs are anomalies that have been intentionally destroyed or stripped of their anomalous properties by the SCP Foundation.”

Pending “SCP articles that have not yet been assigned an object class may be labelled as Pending. This is used to indicate that the Foundation does not currently have enough information to assign an object class to the anomaly.”

Uncontained “SCPs that are not yet contained may be assigned an object class, often Keter”

And finally Esoteric Object Classes

Additional Object classes not listed above are generally created to further the narrative in a particular SCP and only used once, and so are referred to as Esoteric or Narrative Object Classes.

So here’s all of them listed. What’s your favorite article or SCP that is a lesser known class