| Acronym | Meaning |
| ENA | Energetic Neutral Atoms (astronomical Plasmas) |
| WATR | Water Attenuation By Transverse Relaxation |
| DIPPR | Design Institute For Physical Property Data |
| DETOCSY | Diffusion Edited Total Correlation Spectroscopy |
| ERRD | Emergency And Remedial Response Division |
| EHB | Extended Hubbard (hamiltonian) |
| ENCS | Existing And New Chemical Substances |
| GLS | Generalized Least Squares |
| MCQDA | Multichannel Quantum Defect Analysis |
| SMCM | Spatial Multimedia Compartmental Model |