| Acronym | Meaning |
| MOBK | Modified Oppenheimer-Brinkman-Kramers (approxn. In Calcns. On Atomic And Molecular Collisions With Ions) |
| DEFT | Driven Equilibrium Fourier Transform |
| ETFSI | Extended Thomas-Fermi Strutinski Integral |
| LAAS | Laser Atomic Absorption Spectrometry |
| ASGP | Aerobic Suspended Growth Process |
| DSCF | Direct Self-consistent Field |
| PDB | Peedee Belemnite |
| NPS | National Park Service (US) |
| IPA | Independent-pair Approximation |
| DGNAA | Delayed Gamma-ray Neutron Activation Analysis |