| Acronym | Meaning |
 | RAC | Reference Air Concentration (USEPA) |
| IPCC | Intergovernmental Panel On Climate Change |
| DIAL | Differential Absorption Lidar (laser Radar Sensing) |
| PTNO | Perturbation Theory Natural Orbital |
| PTWI | Provisional Tolerable Weekly Intake |
| ICOLC | International Coalition Of Library Consortia |
| RTP | Reinforced Thermoplastic |
| RHFS | Relativistic Hartree-Fock-Slater |
| AMTIR | Amorphous Material Transmitting Infrared Radiation |
| MIKE | Mass-analyzed Ion Kinetic Energy (spectrometry) |
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