All SCP Classes (Some made up)

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Safe: Safe-class SCPs 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 SCPs 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, sentient and/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 SCPs 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 SCPs 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.

Explained: Explained SCPs are commonly articles about 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.

Class 53: An SCP about which nothing is known at all, but has not proven to be dangerous yet either. This class is mostly referred to Scantron's Proposal SCP-001.

Class Cute (Made up): The only known SCP in this class is SCP-999 a.k.a The Tickle Monster.

Class Awesome (Made up): Currently only SCP 420-J has this class, mostly because it is, it even made Dr.Clef smile and could make 682 to mellow a bit... if that isn't awesome I dunno what is.

Yggdrasil: An object capable in any fashion of causing an ZK-End-of-Reality Scenario, or altering reality in a serious, potentially detrimental manner. - You probably know what Yggdrasil is, but i'll explain anyways. In norse mythology, Yggdrasil is the tree that holds up all the nine realms (midgard, asgard, etc.). If you imagine the nine realms as the multiverse, then the destruction of the tree would certainly lead to a ZK Class Scenario.**Anomalous**: A classification for SCPs that are too simplistic to even receive a Safe classification; many of these are little more than curiosities. [SCP-472] was formally assigned this class in 2012, making it the oldest known SCP to use this class (given how common the word anomalous is in SCP articles, the history of this class is difficult to track). The class has sense been used in SCP-1796, SCP-5214, SCP-5524, and SCP-5289. Dr.Gray’s Proposal (originating from the French wiki) uses the class Abnormal; according to A Comprehensive List of Esoteric Classes, this is a variant of anomalous.

Anatta: An object capable of causing a YK-End-of-the-Universe Scenario, or altering the universe in a serious, potentially detrimental manner through non-improbable means. - Anatta is a buddhist concept meaning "non-soul" or, "not-self". It's the idea that all things perceived by the senses, including emotions, are not really "I" or "mine", and therefore, one should not cling to them. It's one of the three marks of existence in buddhism. If a person lost these characteristics, they would cease to exist. Just like the universe in a YK scenario.**Antithesis**: A classification for SCPs that must be actively used, even though this active use prevents the SCP (or other SCPs) from being fully contained. The class is solely used in SCP-5956.

**Apollyon**: Used for SCPs that are impossible to contain, or are about to irrevocably break containment. An SCP with this class will inevitably end the world. The classification was first used in SCP-927 on the Editthis wiki in 2008; it essentially meant that the SCP was a particularly dangerous keter. The original iteration of the Apollyon class did not appear in any additional SCPs, and was ultimately removed from SCP-927 by September of 2008. The class did not appear again until 2014, when it was used in SCP-2317. Dr. Clef, the author of 2317, did not intend for Apollyon to be a serious object class. Rather, the class was meant to indicate that the SCP article was abnormal, and that the documentation was something hidden even from most of the SCP Foundation. Dr. Clef came to regret re-creating the Apollyon class, and removed it from SCP-2317 in March of 2018. Despite Clef's misgivings, Apollyon has had a heavy influence on the SCP writing community. The class is used in SCP-3999 and S.D. Locke’s Proposal (an entry in the SCP-001 hub), both of which were created for the SCP-3000 contest. The class is also referenced in SCP-3148 (A2032), SCP-3799, SCP-3301 and SCP-3557. Following the removal of Apollyon from 2317, the class was used in SCP-4005 and SCP-4057 (both of which were SCP-4000 entries), Jim North's Proposal (an SCP-001 proposal), SCP-4023, SCP-4780, Meta Ike Proposal (an 001 proposal), SCP-4547, SCP-010-INT and SCP-5618.

During the SCP-5000 contest of January-February 2020, five additional Apollyon SCPs were posted. These SCPs were 5000:Evolution Revolution (since deleted), SCP-5500, SCP-5678, SCP-5055, and SCP-5321.

Following the 5000 contest, the class was used in SCP-5939, SCP-5092, SCP-5799, SCP-5391, SCP-3955, McDoctorate's Proposal (main article), SCP-4273, SCP-5157, and SCP-5956 (main article).

**Archon**: A classification for SCPs that should not be contained (even though they are capable of being contained) due to the detrimental effects of containment.

The class originated in I.H.Pickman's Proposal, an 001 Proposal. There, the class indicated that containment would have a disastrous impact on the continued survival of humanity. More colloquially, the Archon class originally meant the SCP "will literally break the world if you contain it." The class was later used in SCP-3455 (where it referred to SCPs that are not contained because of the damaging effects of doing so- the more widely used definition and the one I use above), SCP-4200 (an entry in the SCP-4000 contest), SCP-1661 (replacing the SCP's former Euclid classification), SCP-3310 (replacing the SCP's former Hiemal class), SCP-4043, SCP-4494, SCP-4223, SCP-4778, SCP-4634, SCP-5015 (an SCP-5000 entry), SCP-5009 (also a 5000 entry), SCP-4614,SCP-5122, SCP-5520 and SCP-5644.

**Argus**: A classification for SCPs whose containment procedures may only be carried out by other anomalous organizations. According to daveyoufool, the creator of the class, Argus is a step-up from Cernunnos. The class is solely used in SCP-5298.

**Azathoth**: A classification for SCPs that are incredibly dangerous and destructive. In universe, the class was created by a researcher who was being influenced by an SCP that makes people think it is super dangerous. The class is solely used in SCP-4626.

**Cernnunos**: A classification for SCPs with functional containment procedures that the SCP Foundation refuses to carry out due to the very nature of the features. Typically, the containment procedures raise serious ethical concerns, would result in a massive loss of life, or would require excessive logistics. The class was first used in SCP-4971, where the containment procedure is to kill every living person. It was later used in SCP-5431, where the SCP Foundation determined that containment was more trouble than it's worth. The class is also used in SCP-5699, SCP-5721, SCP-5751, SCP-5849, and SCP-5422.

**Challenge**: An object class used solely in SCP-5242 (referred to as SCP-INTEGER in-universe). The class (to the best of my interpretive abilities) appears to refer to infohazard-esque SCPs that most be referred to in a specific and complex way to successfully contain and document; failure to properly follow proper containment procedures will result in the SCP spreading outside of its own documentation pages and into other information sources such as the SCP database.

**Continua**: A classification for SCPs whose has operation has been greatly altered by the disappearance or destruction of an essential part of the anomaly. The class was originally used by SCP-5649 which was posted on March 13 or 14, 2020 for the 2020 Jamcon and deleted by by late June 2020. On March 23, 2021, the class was reused in SCP-5295 (created for the Jamcon 2021) which gave it an identical definition.

**Damballah**: A classification for SCPs that are currently contained, but where the methods and purpose of containment are unknown. The class is solely used in SCP-5466.

**Da'as Elyon**: A secondary classification for widespread and well-known SCPs that can't be contained due to the beneficial aspects of the SCP; the containment procedures consists of covering up the anomalous aspects of the SCP. The class is solely used in SCP-5338

**Declassified**: A classification for SCPs that the SCP Foundation has revealed to the public. The class is used once in SCP-3882.

**Decommissioned**: An object class for SCPs deliberately neutralized by the SCP Foundation. Originally, decommissioned was a meta-class for SCP that were so poorly written they were destroyed in-universe and added to an out-of-universe wall of shame. This process started in 2008, largely fell out of favor in 2009, and last occurred in 2011. The current definition was coined by SCP-4456-D, which was posted in October 2019 as a tribute of sorts to the original decommissioning process. That same month, Decommissioned was used in a similar manner in SCP-4175, replacing 4175's original neutralized class. Since then, the class has been used in SCP-5075, SCP-4659, SCP-5932, SCP-0000-EX, SCP-5398-D, SCP-5825, SCP-5363-D, and SCP-5281. (For the SCP count at the bottom of the list, I only count SCPs using the new definition).

The new Decommissioned class is also referenced in IHP's SCP-5000 proposal, specifically somewhere in this Twine file. This version is also used in SCP-001-D, a featured tale.

**Dependent**: A class for SCPs that are safe to contain and for which the SCP Foundation has a moral obligation to sustain them. In other words, these SCPs are legally dependent on the Foundation. The class is solely used in an iteration of SCP-5296 (main article).

**Drygioni**: A class for SCPs whose authenticity is under investigation by the Overseer Council. The class is solely used in SCP-4839.

**Ein Sof:** A classification for SCPs that need to be kept sedated to preserve the fabric of reality. The class is solely used in Dr. Gray's Proposal, an 001 proposal.

Dr. Gray's Proposal was originally posted on the French SCP Foundation website in September 2017; the SCP was translated and posted on the English website in September 2019. Ein Sof is the first class in the English wiki (esoteric or official) that originated from a foreign language branch.

**Embla**: A classification for SCPs that the Foundation uses to create other SCPs. The class is used once in Dr. Mann’s Proposal, which is an entry in the SCP-001 hub.

**Enochian**: a class for SCPs that cannot be contained because they constitute baseline reality.. The class was first used in SCP-340-Fr on the French wiki, then some English joke articles, and finally in SCP-4755. This is the second class to come from a foreign language branch.

**Eparch**: A classification for SCPs that are not themselves anomalous, but that are closely related to and acts as evidence of anomalous phenomena. The class was first used in SCP-4015, an entry in the SCP-4000 contest. It was later used in SCP-139, SCP-5977, and SCP-5349.

**Gevurah**: A classification for SCPs that can endangers the inner structure of the Foundation and limit the ability of the Foundation to carry out its secondary objectives. The class is solely used as an object class in SCP-3666. It is is however used as a “disruption class” in SCP-4645. (I do not count this as a usage in my official count).

**Gödel**: A class for SCPs that can be explained using anomalous technology, but would be viewed as anomalous by an uniformed observer and non-augmented science. The class was first used in SCP-4555, an entry in the SCP-4000 contest. It was later used in SCP-5326, [SCP-5078] (http://www.scp-wiki.net/scp-5078), SCP-5347, and SCP-5616.

**Hera**: A classification for SCPs that are hostile but of a high utility to the SCP Foundation. The class is used in SCP-4113.

**Hiemal**: A complex classification for an interrelated set of anomalies that keep each other in check. The class originated in SCP-3240 (for the SCP-3000 contest), and was later used in SCP-3700, SCP-3787, SCP-4540 (for the SCP-4000 contest), SCP-4121, SCP-5365 and McDoctorate's Proposal (main article). A discussion thread on the class can be seen [here.] (http://www.scp-wiki.net/forum/t-2248705)

**Ignosi**: A classification for anomalies that whose discovery, including by the wider SCP Foundation, must be prevented. The class is currently used in Automated Passive Amnestization System Ver. 17.09. Since this is more of a tale than an SCP, I’ve not included this in the count of SCPs with a non-standard class.

**Israfil**: A classification used solely in SCP-5709. According to Elogee FishTruck (the author of the SCP), it refers to the aftermath of SCP-055 and SCP-579 interacting

**Keter-Dark**: An esoteric class with no clear definition that is used instead of the standard Keter for apparently no reason. The class is solely used in SCP-5761 to mock the excessive use of esoteric classes.

**Khonsu**: A classification for SCPs expected to soon by neutralized by means outside of Foundation control. Studying these SCPs before their unavoidable destruction is a high priority. The class is solely used in SCP-5649.

**Maksur**: A classification for SCPs that were broken apart into components that are themselves anomalous, and that must be kept apart from each other. The class was first used by TwistedGears-Kaktus Proposal, an entry in the SCP-001 hub. It is also referenced by SCP-3301 and SCP-4882. The class would later be used in SCP-5241 and SCP-5238.

**Malchut**: A classification used in lieu of "Keter" at Site-19; an anomaly present at the site causes every use of the word "Keter" to be replaced by the word "Peter" and a crude drawing of Peter Griffin from Family Guy. The class was previously used in the now deleted SCP-4342, albeit with an alternative spelling and definition. The only extant SCP using this class is SCP-5148.

**Mendax**: A classification for SCPs that make observers unable to acknowledge the SCP’s existence. The class is solely used in SCP-4955.

**Netzach**: A classification that refers to the Earth and its unique ability to support life. The class is solely used in Billith's Proposal, an entry in the SCP-001 hub.

**Numen**: A secondary class for SCPs that are deities. Numen was originally used as a modification to the base Euclid class (Euclid-numen), but was first used as a stand-alone secondary class in SCP-3906. A complete list of SCPs using Numen as a Euclid sub-class can be viewed here.

**Paradox-Apollyon**: A classification used for SCPs that will inevitably destroy humanity; the only way to halt the SCP is to destroy humanity. In other words, these SCPs are paradoxes that will destroy humanity if no solution is found. The class is solely used in Arbelict's proposal, an SCP-001 proposal.

**Paradox-Thaumiel**: A classification for SCPs designed to destroy humanity and the universe. The class is solely used in Arbelict's proposal, an SCP-001 proposal. In that proposal, humanity was on the verge of destroying the multiverse; the decision was made to sacrifice humanity for the benefit of other universes without humans.

**Principalis**: A classification for threats, anomalous or otherwise, that directly threaten the 05 Council and thus the existence of the SCP Foundation. The class is solely used in djkaktus's Proposal III, an SCP-001 proposal.

**Kronecker**: An anomalous object class that replaces other SCP object classes in SCP entries. The Foundation has voluntarily classified SCP-2062 with this class. Out of universe, SCP-2062 is the only entry the class appears on.

**Kušum**: A classification for SCPs whose containment procedures have been abandoned indefinitely. The class was first used in SCP-3319. It was later used in SCP-5669.

**Realitätsbrecher**: A class for SCPs that are highly unstable and lose substantial threats to baseline reality; containment consists of maintaining the integrity and stability of the SCP. The class is solely used in SCP-4582.

**Simpatico**: A classification for SCPs that are unpredictable but not dangerous. The class is solely used in an iteration of SCP-4939 (main article).

**Sköll**: A classification for SCPs that are unavoidably decaying or being destroyed. These SCPs will inevitably be neutralized, break containment, or both. The class is solely used in SCP-5651.

**Skótos:** A secondary classification for SCPs whose "research and documentation is still in progress or severely lacking.". The class is solely used in SCP-5703.

**Spiritual:** An anomalous object class (and containment procedure) that will randomly insert itself into SCP documents. While the object class can normally be edited out of SCP articles, this has proven impossible in the SCP article describing the anomalous object class. This class is solely used in SCP-4487. It was originally used in an earlier version of SCP-4487 where it referred to SCPS that are "incorporeal anomalous entities."

**Terminal**: A secondary classification for SCPs that incorporate human identities after the death of their physical bodies. In other words, these SCPs constitute some form of afterlife. Note that if the SCP Foundation can "contain" the afterlife itself (i.e. prevent reanimation or destroy the entity allowing the afterlife), then it is not considered terminal. See this explanation for more details on the class.

The class was first used on the Spanish wiki on June 2018 in SCP-ES-163. The class was used a second time in SCP-ES-145, which was posted in October of that year. SCP-5523 was the first English language SCP to use the SCP (this was an original entry, not a translation). Amelia Wright, the author of 5523, obtained the class from an extensive explanation posted by the author of ES-145 to the article’s posting on the International Translation Archive. (Note: I only count uses on the English language website for my object count at the bottom of this page). The class was later used in SCP-5961 and SCP-5572.

**Tiamat**: A classification for SCPs that pose an immediate and irrevocable threat to humanity, and which need to be dealt with swiftly to protect humanity. The class is essentially on the brink of becoming an Apollyon: the Foundation has a small number of last-ditch options to stop the SCP (such as conventional bombardments or prototype weapons), but if these options fail fail then humanity is doomed. The class was first used in SCP-3895. It was later used in SCP-4931 (an SCP-4000 contest entry), SCP-3396 (replacing the SCP's former keter class), SCP-5034, and SCP-5866.

**Truculent**: A secondary class for SCPs that are fluid, changing and unpredictable; the containment procedure of SCPs with this class must be continuously updated . The class is solely used in SCP-4703.

The class was first proposed in January 2014 by schifter (a Wikidot member who has since deleted their account) as a theoretical class for SCPs that are dangerous, unpredictable and dangerous to interact with. The class was included in Nagiros's A Comprehensive List of Esoteric Classes article in May 2019. PeppersGhost, the author of 4703, included the class after reading through Nagiros's list and determining that the class had potential; 4703 was posted in September 2019.

**Ticonderoga**: A classification for SCPs that are too powerful or evasive to contain with available technology, but do not require any extensive containment procedures due to their nature. The class was originally created for SCP-4444 (an entry in and the second place winner of the SCP-4000 contest). It was later used in SCP-4270, SCP-5494, SCP-5464, SCP-5170 (main article), SCP-5623 (main article), and SCP-5814.

**Yesod**: A class for contained anomalies that have been integrated into the command structure of the SCP Foundation. The object class was originally used in spikebrennan's proposal (an 001 proposal posted in August 2017), where it referred to the single blind spot of the Judeo-Christian God and the command center built within it. In August 2019, Spikebrennan posted a second SCP using the class: SCP-4436. The SCP is about a computer system, constructed out of the bread and wine of communion, that can be used to upload human consciousness. This SCP cemented the current definition and expanded Yesod from a one-off to a class that can be reused. The class was later used in SCP-5292.

**Zenzizenzizenzic**: An undefined object class used by a Foundation employee whose brain was in the process of being reprogramed. The scientist was writing a stream of containment procedures, each one more incoherent and disconnected from the standard SCP style than the last. At one point, the scientist even listed "dishwasher" as an object class. The Zenzizenzizenzic class appeared in one of the last containment procedures when the scientist was still reasonably lucid and not completely overtaken by the SCP. The class is solely used in SCP-5145.

**Zeno**: Used for SCPs that have medium containment difficulties but pose a low threat. The class is used solely in SCP-2005, a submission to the SCP-2000 contest.

**Zurvan**: A class for SCPs that cannot be contained and should not be contained because these SCPs constitute an element of baseline reality. The class is solely used in an iteration of SCP-5103 (main article). (Note that the iteration claims to be an 001 proposal, but does not actually occupy an 001 slot so will not be counted as such in the below tally).

**Analysis**: The use of non-standard classes is uncommon. There are a grand total of 48 non-standard object classes, which are used by 136 SCPs. Most of the SCPs using these classes are either 001 proposals or entries in the 2000, 3000, 4000 or 5000 contest. Only 38 of the classes and 119 of the SCPs appear outside of the 001 hub. (Note: some SCPs are used more than one class; these SCPs were only counted once).

Only the Apollyon, Hiemal, Archon, Tiamat, Yesod, Cernunnos, Gödel, Ticonderoga, Eparch, Maksur, Kušum, Terminal, Decommissioned and Anomalous classes appear in more than one entry. Most of the remaining classes were essentially designed as one-offs: they have such specific criteria that they can’t feasibly be reused.

**Antithesis**: A classification for SCPs that must be actively used, even though this active use prevents the SCP (or other SCPs) from being fully contained. The class is solely used in SCP-5956.