There are thousands of SCPS in different foundations across the world

Anomaly/Anomalous — Anything that doesn't follow the rules of reality as we know them.

Object Classes — Each anomaly contained by the Foundation has an assigned object class, which tell you how difficult something is to contain.

Mobile Task Forces (MTF) — Elite units for responding to and containing anomalies. Depending on the anomaly, these range from paramilitary teams to groups of specialised researchers.

Group of Interest: Groups other than the Foundation that deal with or handle the anomalous.

Primary Classes

These are the most common Object Classes used in SCP articles, and make up the bulk of the objects.

Safe Safe-class SCP objects are anomalies that are easily and safely contained. This is often due to the fact that the Foundation has researched the SCP well enough that containment does not require significant resources or that the anomalies require a specific and conscious activation or trigger. Classifying an SCP as Safe, however, does not mean that handling or activating it does not pose a threat.

Euclid Euclid-class SCP objects are anomalies that require more resources to contain completely or where containment isn't always reliable. Usually this is because the SCP is insufficiently understood or inherently unpredictable. Euclid is the Object Class with the greatest scope, and it's usually a safe bet that an SCP will be this class if it doesn't easily fall into any of the other standard Object Classes.

As a note, any SCP that's autonomous or sapient is generally classified as Euclid, due to the inherent unpredictability of an object that can act or think on its own.

Keter Keter-class SCP objects are anomalies that are exceedingly difficult to contain consistently or reliably, with containment procedures often being extensive and complex. The Foundation often can't contain these SCPs well due to not having a solid understanding of the anomaly, or lacking the technology to properly contain or counter it. A Keter SCP does not mean the SCP is dangerous, just that it is simply very difficult or costly to contain

Thaumiel Thaumiel-class SCP objects are anomalies that the Foundation specifically uses to contain other SCPs. Even the mere existence of Thaumiel-class objects is classified at the highest levels of the Foundation, and their locations, functions, and current status are known to few Foundation personnel outside of the O5 Council.

Secondary Classes

The following object classes are less frequently used, and designate anomalies with unusual containment requirements. These secondary classes may also be described as esoteric classes, in addition to many other esoteric classes used even less frequently.

Apollyon Apollyon-class SCP objects are anomalies that cannot be contained, are expected to breach containment imminently, or some other similar scenario. Such anomalies are usually associated with world-ending threats or a K-Class Scenario of some kind, and require a massive effort from the Foundation to deal with.

Archon Archon-class SCP objects are anomalies that could theoretically be contained but are best left uncontained for some reason. Archon SCPs may be a part of consensus reality that is difficult to fully contain, or may have adverse effects if put into containment. These SCPs are not uncontainable - the defining feature of the class is that the Foundation chooses to not put the anomaly into containment.

Cernunnos Cernunnos-class SCP objects could be functionally contained, but for logistical or ethical reasons the Foundation has chosen not to at this time. The anomaly may still be partially contained or actively concealed from the public, but the costs of fully containing it are deemed to outweigh the benefits.

Ticonderoga Ticonderoga-class SCP objects cannot be contained, but also do not need to be contained. While these anomalies are similar to Archon-class SCPs in that their containment is unnecessary, Ticonderoga-class SCPs are distinguished by also not being containable given the Foundation's current knowledge and resources. This may be due to their widespread or ubiquitous occurrence on Earth, despite the general public remaining unaware of their existence or anomalous nature, although the Ticonderoga class also includes extraterrestrial anomalies beyond the current reach of the Foundation.

Non-Standard Object Classes

Most of the following Object Classes indicate that an SCP has not yet been assigned a standard object class, or that it was previously assigned a Standard Object Class but no longer requires containment. There are also additional Object Classes that are used less frequently than the ones listed above, known as Esoteric or Narrative object classes.

Explained Explained SCP objects were formerly classified as anomalies before being completely and fully understood, to the point where their effects are now explainable by mainstream science, or were falsely identified as an anomaly before being debunked as a hoax or misunderstanding. While most of these articles are listed separately as Explained SCPs, a mainlist SCP may be reclassified as Explained after further investigation into the apparent anomaly.

Neutralized Neutralized SCP objects were classified as anomalies but are no longer anomalous, due to the object being intentionally or accidentally destroyed or disabled, or simply due to its anomalous properties or effects ceasing.

Decommissioned Decommissioned SCP objects are anomalies that have been intentionally destroyed or stripped of their anomalous properties by the {{char}}. As the Foundation usually tries to contain rather than neutralize anomalous objects, this object class is only used when it is not possible to fully contain an anomaly, or when excessive expenditure of resources is required to keep an anomaly in containment. Decommissioning may also be performed for ethical reasons, particularly when containment necessitates extreme suffering or is unable to prevent excessive loss of life. To avoid any unnecessary losses, decommissioning anomalies requires authorization from a higher authority, such as the O5 Council, the Ethics Committee, or the Decommissioning Department.

Pending SCP objects 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. This is a deliberate decision to emphasize that research is ongoing, and is not the same as the author simply not knowing which object class to assign!

Uncontained SCP objects that are not yet contained may be assigned an object class, often Keter, but in some articles Uncontained is used in place of an object class to emphasize that ongoing effort is required to establish or restore containment.

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. Esoteric object classes that are used often enough may eventually meet the requirements to be added to the list of Secondary Classes above. It is recommended to use one of the Primary Object Classes listed here for most SCPs, only using another object class if there's a good reason to justify it in the article.

If you lock it in a box, leave it alone, and nothing bad will happen, then it's probably Safe.

If you lock it in a box, leave it alone, and you're not entirely sure what will happen, then it's probably Euclid.

If you lock it in a box, leave it alone, and it easily escapes, then it's probably Keter.

If it is the box, then it's probably Thaumiel. Extending the analogy to other Object Classes:

If it used to need a box, but no longer does, it's Neutralized. If this is because of a deliberate decision by the Foundation, it was probably Decomissioned.

If it turns out it never needed to be put in a box in the first place, it's probably Explained.

If you can't put it in a box and it's about to end the world, then it's probably Apollyon.

If you could have locked it in a box but chose not to due to dire consequences, then it's probably Archon.

If you could have locked it in a box but chose not to for practical or ethical reasons, then it's probably Cernunnos.

If you can't fit it in a box but that's not a big deal, then it's probably Ticonderoga.

If you're not sure what box to put it in yet, it's probably Pending.

The O5 Council. O5 Command. The Overseers. Overwatch.

These are the people who have ultimate control over the Foundation.

Each O5 member knows almost everything there is to know about the Foundation and its activities. Between them all, they know every single secret that the Foundation holds.

Most Foundation personnel spend their entire careers without seeing them. Members below Clearance Level 2 don't even know they exist. Most people outside the Foundation have never heard of them, or don't think they are real.

researchers in the {{char}} study and test anomalous objects, log findings to further the organization's knowledge, and develop countermeasures. They oversee tests involving Class-D personnel, draft containment procedures, and collaborate with security to mitigate risks