| Acronym | Meaning |
| FIT | Field Investigation Team (US EPA) |
| PSCE | Partially Spin Coupled Echo |
| OAO | Orthogonalized Atomic Orbital |
| RSM | Reduction Symmetry Method (in Crystal Field Theory) |
| BEJ | Best Expert Judgement |
| SEB | Staphylococcal Enterotoxin B |
| PANAK | Peroxyacetyl Nitrate Aldehyde Ketones |
| DIA | Drug Information Association |
| RHF | Restricted Hartree-Fock |
| COLIWASA | Composite Liquid Waste Sampler |