What quantum number specifies the orbital orientation in space?

The quantum number that specifies the orbital orientation in space is the magnetic quantum number, denoted as ( m_l ). This quantum number can take integer values ranging from (-l) to (+l), where ( l ) is the azimuthal (angular momentum) quantum number. Each value of ( m_l ) corresponds to a specific orientation of the orbital within a given subshell. For example, in the p subshell, ( l = 1 ), and ( m_l ) can be (-1, 0, +1), indicating the three possible orientations of p orbitals.