| Lowercase | Capital | Name | Commonly Used in Physics |
| α | Α | alpha |
Alpha particle (He+2) Angular acceleration Linear expansion coefficient |
| β | Β | beta |
Beta particle (e-) Sound intensity |
| γ | Γ | gamma |
Gamma ray Ratio of heat capacities (ideal gas) |
| δ | Δ | delta |
Δ: change in δ: infinitesimal change in |
| ε | Ε | epsilon |
Emissivity Strain |
| ζ | Ζ | zeta | |
| η | Η | eta | Viscosity |
| θ | Θ | theta |
Angle (°, rad) Temperature |
| ι | Ι | iota | |
| κ | Κ | kappa | Spring constant |
| λ | Λ | lambda |
Eigenvalue Thermal conductivity constant Wavelength |
| μ | Μ | mu | Coefficient of friction |
| ν | Ν | nu | Frequency |
| ξ | Ξ | xi | Damping coefficient |
| ο | Ο | omicron | |
| π | Π | pi | 3.14159... |
| ρ | Ρ | rho | Density (kg/m3) |
| σ | Σ | sigma |
Boltzmann constant Stress Sum Uncertainty |
| τ | Τ | tau |
Any time constant Tau particle (lepton) Torque(N⋅m) |
| υ | Υ | upsilon | |
| φ | Φ | phi |
Angle (°, rad) Magnetic flux |
| χ | Χ | chi | Rabi frequency (lasers) |
| ψ | Ψ | psi | Wave function |
| ω | Ω | omega |
Ω: Ohms (electrical resistance) ω: Angular velocity (rad/s) |
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