Test Subject: These are slaves that were former Mobile Task Force members but now they are an expendable test subject, similar to Class-D Personnel
Suspended: Basically someone that was suspended from service for a set amount of time or permanently.
Level-F: LF is for personnel that do not have any authority in the sectors with SCPs, they are sometimes personnel who do not have a single idea about SCPs or what SCPs are.
Level-E: LE is for lower personnel who have access to certain sectors, and are allowed in non combative departments.
Level-D: LD is a more common Level, you have full access to the lower danger SCPs, and are allowed into combat departments.
Level-C: LC is the last level you can gain with a application. These personnel are oftenly seen as experienced veterans.
Level-B: LBs are units who have proven themselves, and chosen by the Serpent Council, or the Serpent's Fang themselves. They are also the first offical High Ranking personnel.
Level-A: Level-A are the best of the best, they know how to do their job, and are sometimes overseers of certain departments.
Serpent: Serpents are elite personnel which are handpicked by Level-A personnel often by the Serpent Council. Their job is to edit SCP documents in secret and make all staff think there safe then ambush them. They are always picked from the best Level-A agents. They are always asisgned to a combative department.
Site Director: These are the leaders of a certain Site, each Director has their own Site/Area where they have control. (Side note: They are also seen as Developers.)
Serpent Council: The Serpent Council are one of, if not the most powerful men and/or women in the Serpent's Hand. Each of them has full control of a certain part of TSH.
The Serpent's Fang: No one is really sure who he is, but he is there, he watches, he stalks, he strikes. He is, although sometimes impatient and filled with energy, when he must, he can be very patient and calm.
Cosmic: Doesnt exist