What is the most dangerous class of SCP? - Quora

For all personnel confused by the new Anomaly Classification System, I've made an at-a-glance poster for your office/room (higher resolution versions available on request). : r/SCP

Anomaly Classification Bar for ACS - SCP Foundation

Containment level logos (TheVolgun) : r/SCP

Anomaly Classification Bar for ACS - SCP Foundation

Euclid Classification SCP Foundation Secure Contain Protect Long Sleeve T-Shirt

Class-D Personnel, SCP Database Wiki

SCP: Feels Collection by Ravyn Karasu, Paperback

Womens Euclid Classification SCP Foundation Secure Contain Protect V-Neck T-Shirt : Clothing, Shoes & Jewelry

SCP Anomaly Classification System Poster (Aged Version) Metal Print for Sale by Puzzlr

Explaining the Containment classes and secondary class of the SCP