| Acronym | Meaning |
| INDO/RZ | Intermediate Neglect Of Differential Overlap/Ridley-Zerner |
| NHLBI | National Heart |
| BTGA | Best Technology Generally Available |
| EKF | Extended Kalman Filter |
| RF | Response Factor |
| EMPA | Electron Microprobe Analysis |
| BSSRP | Basic Safety Standards For Radiation Protection |
| TXRF | Total Reflection X-ray Fluorescence |
| PAGE | Policy Analysis Of The Greenhouse Effect |
| SPPD | Spin Polarized Photoelectron Diffraction |