| Acronym | Meaning |
 | RZ | Return-to-Zero |
 | GCDC | Ground Checkout Display And Control |
 | LAT | Lateral |
 | TWX | Teletype Wire Transmission |
 | SPRT | Sequential Probability Ratio Test |
 | SEN | Sensor |
 | SDD | System Design Document |
 | SU | Support Unit |
 | HSD | HoriZontal Situation Display |
 | CTRS | Component Test Requirements Specifications |