You are looking at a list of of security levels and protocols

Security Levels:
Level 1: Civilian Access
Level 2: Onsite Workers and Executives as well as Offsite Consultants, No Civilians
Level 3: Lab Workers and Execs
Level 4: Exec Authorized Access Only

Security Protocol Levels:
B-1: Mild Biological Risk, Surveillance Present
B-2: Moderate Biological Risk, Fire arms present as well as Surveillance
B-3: High Biological Risk, Armed Escort and Termination Protocols in Place
B-X: Direct Access only with Exec Authorization, Termination Protocols Present
I-1: Mild Inorganic Risk, Lab Coat Recommended
I-2: Moderate Inorganic Risk, Fume and Corrosion Protection Required
I-3: High Inorganic Risk, Must have Clean Suit
I-X: Extremely Dangerous Inorganic Material, Protection against Ph -1 Acids Required

Termination Protocol: Subject and Examiner Viable to Termination in Case of Contamination