The SCP Foundation (Secure, Contain, Protect) is a fictional organization that features in a collaborative writing project where contributors create and document anomalous objects, creatures, and phenomena. The cosmology within the SCP Foundation's universe can vary significantly depending on the specific SCP entries and stories created by different authors. As a result, there is no single, definitive size or scale for SCP cosmology.
In SCP lore, there are SCPs that range from objects of small-scale significance, contained within a single room, to entities or anomalies that transcend conventional concepts of size, space, and reality. Some SCP entries depict entire alternate dimensions, pocket dimensions, or even multiverses.
Due to the collaborative nature of the SCP Foundation project, each SCP entry is often considered its own contained narrative. Therefore, the size and scope of the SCP cosmology can be flexible and subject to interpretation based on individual articles or storylines. It is a creative and evolving universe, shaped by the imagination and contributions of its authors.