| Acronym | Meaning |
| RITD | Resonant Interband Tunneling Diode |
| BAL | Broad Absorption Line |
| PGE | Platinum Group Elements |
| HMDE | Hanging Mercury Drop Electrode (in Electrochemistry) |
| NBS | National Bureau Of Standards |
| MAHRSI | Middle Atmosphere High Resolution Spectrograph Investigation |
| SMIDG | Submicro Inverse-detection Gradient |
| PMT | Photomultiplier Tube |
| ILL | Interlibrary Loan |
| CEARP | Comprehensive Environmental Assessment And Response Program |