| Acronym | Meaning |
| VOIP | Valence Orbital Ionization Potential |
| LACO | Linearized Atomic Cell Orbital (in Energy-band Calcn.) |
| NELAP | National Environmental Laboratory Accreditation Program |
| PCI | Perturbative Configuration Interaction |
| APECED | Autoimmune Polyendocrinopathy-candidiasis-ectodermal Dystrophy |
| NPP | Net Primary Productivity |
| MSP | Macrophage Stimulating Protein |
| SMIL | Synchronized Multimedia Integration Language |
| ESS | European Spallation Source |
| IASI | Infrared Atmospheric Sounding Interferometer |