The symbol "μ₀" represents the permeability of free space, a fundamental physical constant in electromagnetism. It quantifies how easily magnetic fields can penetrate a vacuum. The value of μ₀ is approximately 4π × 10⁻⁷ T·m/A, where T is tesla, m is meter, and A is ampere. This constant is crucial for understanding the behavior of magnetic fields in various materials and systems. In the context of Maxwell's equations, μ₀ plays a vital role in describing how electric currents produce magnetic fields. It is essential for calculating the inductance of coils and the propagation of electromagnetic waves in a vacuum, linking electricity and magnetism in the framework of classical physics.