| Acronym | Meaning |
| LOC | Lines Of Code |
| SVIP | Secure Voice Improvement Program |
| PTPR | Program Test Procedures And Reports |
| B/U | Backup |
| CTS | Contract Technical Services |
| CSTIRS | C School Training Input Requirements System |
| EI | Engineering Information |
| SAC | System Auxiliary Computer |
| LT | Light |
| DBDD | Data Base Design Document Udi-e-21250b/mod |