| Acronym | Meaning |
| UCHFPT | Uncoupled Hartree-Fock Perturbation Theory |
| PCFB | Pressurized Circulating Fluidized Bed (gasification Apparatus) |
| CNDO/OPTIC | CI Method For Elec. Transition Moments Of The Optical Transition Of Large Mols. Based On CNDO/S Parametrization |
| LBSF | Local Back Surface Field (solar Cells) |
| ELF | Environmental Load Factor |
| SCIA | Semiclassical Impact Approxn. (in Ionizing At. And Mol. Collision Calcns.) |
| ARRP | Ammonia Removal And Recovery Process |
| TFFF | Thermal Field Flow Fractionation |
| SCIT | Standing Committee On Information Technologies |
| FF-MBPT | Finite-field Many-body Perturbation Theory |