| Acronym | Meaning |
| GRNN | Generalized Regression Neural Network |
| QCCA | Quasiclassical Close-coupling Approximation |
| RNG | Renormalized Group Theory |
| E-CATS | Electronic Catalog System |
| CAS-SI | Complete Active Space-state Interaction |
| SDGUGA | Shape-driven Graphical Unitary Group Approach |
| APWA | American Public Works Association |
| RA | Reduced Aggregate (interplanetary Dust Particle) |
| PKC | Protein Kinase C |
| EIT | EUV (extreme Ultraviolet) Imaging Telescope |