Magnetic Quantum number determines

The four quantum numbers describe electrons in an atom:Principal Quantum Number ($n$): Determines the size and total energy of an orbital.Azimuthal Quantum Number ($l$): Determines the shape of the orbital.Magnetic Quantum Number ($m_l$): Determines the spatial orientation of the orbitals relative to a coordinate system.Spin Quantum Number ($m_s$): Determines the spin direction of an electron.