Z0, Z0 or 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 This disambiguation page lists articles associated with the same title formed as a letter-number combination. If an internal link led you here, you may wish to change the link to point directly to the intended article.