| Acronym | Meaning |
 | RCT | Radiometric Calibration Target |
| SL | (Comet) Shoemaker-Levy / SpaceLab |
| MARS | Series Of Soviet Mars Spacecraft |
| IML | International Microgravity Lab |
| SMC | Small Magellanic Cloud |
| CADH | Communications And Data Handling |
| OTV | Orbital Transfer Vehicle |
| APT | Automatic Picture Transmission |
| WFPCII | Replacement For WFPC |
| DSO | Detailed Supplementary Objective |
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