| Acronym | Meaning |
| PAPS | Phase-alternated Pulse Sequence |
| ICSS | Isobaric Crystallization From Supercritical Solution |
| PHENIX | Pioneering High Energy Nuclear Interaction EXperiment |
| PSP | Progressive Supranuclear Palsy |
| AMAP | Automated Molecular Assembly Plant |
| BEBO/R | Relaxed Bond Energy-bond Order Method |
| APTIC | Air Pollution Technical Information Center |
| CFSS | Constant-final-state Spectroscopy |
| NEBD | Nonequilibrium Brownian Dynamics |
| ARM | Agricultural Runoff Model |