| HPLC | High Performance Chromatography |
| MC | Merocyanine molecule |
| NMR | Nuclear Magnetic Resonance |
| RK | Runge-Kutta numerical integration method |
| SP | Spiropyran molecule |
| TTC | Trans-Trans-Cis isomer of spiropyran (the same meaning for T and C applies for TTT, CTT and CTC) |
| UV | Ultraviolet spectrophotometry or range |
| Vis | Spectrophotometry or spectral range relating to the visible range of the electromagnetic spectrum |