| Acronym | Meaning |
| LRR | Leucine-rich Repeat |
| NDIR | Nondispersive Infrared Analysis |
| ELSA | Emergency Level Scale Assessment |
| WRAC | Waste Reduction Audit Checklist (component Of WRAS) |
| HDF | Hubble Deep Field |
| AMMRC | Army Materials And Mechanics Research Center |
| CGC | Constrained Geometry Catalyst |
| RCCSD | (partially) Restricted CCSD |
| MR-MBPT | Multireference-many-body Perturbation Theory |
| LAEC | Lowest Achievable Emission Rate |