[Permeability]

Permeability

The ability of material to conduct magnetism

In electromagnetism, permeability is the measure of magnetization produced in a material in response to an applied magnetic field. Permeability is typically represented by the Greek letter μ. It is the ratio of the magnetic induction to the magnetizing field as a function of the field in a material. Read more about permeability on wikipedia

The permeability of vacuum (μ0) is 1.256•10-6 T/(A/m) or 1 G/Oe.