| Acronym | Meaning |
| COBOL | Common Business Oriented Language |
| IRP | Intermediate Rated Power (30 Minutes) |
| SONAR | MT Sonar Maintenance Trainer |
| RDR CTRL | Radar Control |
| PTT | Plotting Team Trainer |
| LPOILR | Low Oil Pressure Right |
| ITSS | Integrated Tactical Surveillance System |
| EAB | Emergency Air Breathing (comm Sys For Submarines) |
| AEA | Auxillary Engine Assembly |
| PVS | Periscope View Simulators (associated With 21a Series) |