| Acronym | Meaning |
| ICMRCI | Internally Contracted MR-CI |
| ICRU | International Commission On Radiation Units And Measurements |
| LACO | Linearized Atomic Cell Orbital (in Energy-band Calcn.) |
| MEMOSA | Microelectromechanical Optical Sensor Array |
| CCM | Cyclic Cluster Model (in CNDO For Deep Levels In Solids) |
| PP-MRD-CI | Pseudopotential-multireference Double Excitation-CI |
| NSWMA | National Solid Wastes Management Association |
| QRHF-CC | Quasirestricted Hartree-Fock Coupled Cluster |
| EDA | European Desalination Association |
| MIDAS | Microimaging Dust Analysis System |