| Acronym | Meaning |
| ELINT | Electromagnetic Intelligence |
| MTEC | Maintenance Test Equipment Catalog |
| C&T | Communications And Tracking |
| STC | Systems Test Complex |
| IN | Information Systems Directorate (KSC) |
| NSTL | National Space Technology Laboratories |
| SEI | SYstem Engineering Groundrule |
| OPDAR | OPtical Detection And Ranging |
| CCS | Computer Core Segment |
| QUAT | Quaternion |