z₀ may refer to:
- Characteristic impedance, a ratio used in electronics
- Impedance of free space, a physical constant
- Z boson, an elementary particle that mediates the weak force
a rare rail transport modelling scale
- Roughness length, a factor used in wind speed calculations
- z₀ sex-determination system in biology
Landing: https://fmonk.quasigentsia.com/archives/8278
