Equiprobability surfaces for hydrogen orbitals correspond to the wavefunctions . Here is the principal quantum number, is the total angular momentum quantum number, and is the magnetic quantum number. Hydrogen orbitals are covered in a first-year quantum mechanics course. The pictures presented are typically ambiguous in what they display. The proper way is to show equiprobability surfaces.
— principal quantum number — total angular momentum quantum number — projected angular momentum quantum number — fraction of the maximal probability density