| Symbol | Units | Description |
| x | (mm) | forcing excitation function |
| X 0 | (mm) | forcing excitation magnitude |
| y | (mm) | response excitation function |
| Y 0 | (mm) | response excitation magnitude |
| g | (deg) | angular oscillation |
| m | (kg) | mass |
| b | (mm2/s) | cinematic viscosity |
| βcr | (mm2/s) | critical viscosity |
| k | (N/mm) | stiffness |
| ω | (rad) | pulsation |
| ω 0 | (rad) | natural pulsation |
| φ | (rad) | phase of the transfer function |
| λ | pulsation ratio | |
| τ | viscosity ratio | |
| g | (m/s2) | gravity acceleration |
| t | (s) | time |
| T | (s) | wave period |
| f | (Hz) | wave frequency |
| M | (kg) | spar buoy or scale model mass |
| d | (mm) | spar buoy or scale model diameter |
| S | (mm) | buoy sinking |
| He | (mm) | emerged height of the spherical cap |
| L | (mm) | barycentric length between spherical cap and ballast |
| B | (N) | Buoyancy |
| λvert | vertical oscillations pulsations ratio | |
| λang | angular oscillations pulsations ratio | |
| wd | (mm) | wave magnitude |
| I | experimental setup signals generator | |
| O | experimental setup signals acquisition | |
| o 1 | linear displacement signal | |
| o 2 | load cell signal | |
| o 3 | PPT voltage signal | |
| R | (kΩ) | load resistance |
| Z | (MΩ) | load impedance |
| Vpk -pk | (V) | PPT peak-to-peak voltage |
| P | (mW) | harvested electric power |
| E | (mJ) | harvested electric energy |
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