| Acronym | Meaning |
 | SPIRIT | Spatial IR Imaging Telescope |
| TAP | Toxic Air Pollutant |
| NPS | National Park Service (US) |
| COPNA | Condensed Polynuclear Aromatics |
| MCVP | Metal Chemical Vapor Deposition |
| MHC | Major Histocompatibility Complex |
| WHH | Width At Half Height [in X-ray Diffraction] |
| SQRD | Square Root Darwin Term (correction To T And V Operator) |
| BEA | Bureau Of Economic Analysis |
| CHEST | Combined Higher Education Software Team |
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