| Symbol | Denotation |
| ROS | Reactive oxygen species, including non-radicals |
| Radical | Species with an unpaired electron (e−) |
| O2 | Molecular (triplet) oxygen, two unpaired e−, stable |
| 1O2 | Singlet molecular oxygen, e− paired, unstable |
| O2•− | Superoxide radical |
| H2O2 | Hydrogen peroxide |
| HO− | Hydroxide ion |
| HO• | Hydroxyl radical |
| HOO• | Hydroperoxyl radical |
| e− | Electron |
| h+ | Positive hole |
| Me | Metal |
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