| Acronym | Meaning |
| BOA | Bidirectional Orbital Approximation (in Valence Bond Theory) |
| LCN | Light Cracked Naphtha |
| PIRG | Public Interest Research Group |
| PESC | Photoelectrochemical Solar Cell |
| CSOM | Confocal Scanning Optical Microscopy |
| LCBO | Linear Combination Of Bloch Orbital |
| EMEP | European Monitoring And Evaluation Program |
| MCCEM | Multi-chamber Concentration And Exposure Model |
| APPI | Atmospheric Pressure Photoionization |
| BIRD | Bilinear Rotation Decoupling |