| Acronym | Meaning |
| BTF | Biotransfer Factor |
| PVOH | Polyvinyl Alcohol |
| API | Air Pollution Index |
| TVS | Triangular Voltage Sweep |
| QCISD(T) | Quadratic CI (with) Single (and) Double (excitations) (and) [triple Excitations Added Perturbatively] |
| GPPS | General Purpose Polystyrene |
| HCI | Highly Charged Ion |
| MPO | Modified Polarized Orbital |
| ROS | Restricted (or Roothaan) Open-shell (Hamiltonian) |
| WEF | Water Environment Federation (formerly WPCF) |