| Acronym | Meaning |
| AISI | American Iron And Steel Institute |
| IAPA | Independent Asymptotic Pair Approxn. (in Electronic Structure) |
| PWSA | Ports And Waterways Safety Act |
| BPP | Bloembergen |
| RBM | Radial Breathing Mode |
| HFET | Heterostructure Field Effect Transistor |
| CNTF | Ciliary Neurotrophic Factor |
| PBL | Planet Boundary Layer (in Atmospheric Chemistry And Physics) |
| PRISM | Parameter-related Internal Standard Method |
| HAM | Hydrogenic Atoms In Molecules |