| Acronym | Meaning |
| NMHC | Nonmethane Hydrocarbons |
| MPPCF | Millions Of Particles Per Cubic Foot |
| APSGF | Antisymmetrical Product Of Strongly Orthogonal Group Functions (a Wave Function) |
| TEC | Teo Electron Counting Method (for Complexes |
| DGD | Decision Guidance Documents |
| DQC | Decagonal Quasicrystal |
| MCP | Major Capsid Protein |
| LEL | Lowest Effect Level |
| SNAP | System For Nuclear Auxiliary Power |
| NTRM | NIST Traceable Ref. Materials |