| Acronym | Meaning |
| PT2D | Second-order Perturbation Theory (with) Diagonal (part Of Fock Matrix) |
| PTEAM | Particle Total Exposure Assessment Methodology |
| IP | Inhalable Particle |
| ELAS | Electro Acoustic Spectrometry |
| PEG | Polyethylene Glycol |
| APSA | Advanced Photovoltaic Solar Array |
| AACE | American Association Of Coast Engineers |
| ICP | Interactive Correlation Partitioning |
| OMVPE | Organometallic Vapor-phase Epitaxy |
| IDMA | Isotopic Dilution And Mass Analysis |