| Acronym | Meaning |
 | TPCE | Tank Pressure Control Experiment |
| APU | Auxiliary Power Unit |
| E | Elliptical (for Galaxies) |
| IOA | Institute Of Astronomy (Cambridge) |
| NOAA | National Oceanic And Atmospheric Administration |
| ESIS | European Space Information System |
| TRMM | Tropical Rainfall Measuring Mission |
| FHST | Fixed Head Star Trackers |
| EUVE | Extreme UltraViolet Explorer |
| UKST | United Kingdom Schmidt Telescope |
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