What does the third quantum number i describe?

The third quantum number, known as the magnetic quantum number (denoted as (m_l)), describes the orientation of an orbital in space. It can take integer values ranging from (-l) to (+l), where (l) is the azimuthal quantum number. This quantum number thus indicates the specific orbital within a subshell that an electron occupies, such as the orientation of a p, d, or f orbital in relation to an external magnetic field.