This orbital corresponds to a value of one for the angular momentum quantum number.
The only example of one of these types of orbitals being filled in violation of Madelung's rule is in lawrencium. Examples of these orbitals are generally expressed using a single subscript of x, y, or z, and these have no density a points where the variable matching its subscript equals zero. Pictures of this tend to look like two balloons being pushed together. This orbital corresponds to a value of one for the angular momentum quantum number. Name this orbital type containing three pairs of electrons at each principal quantum level after the first, a dumbbell-shaped orbital contrasted with s, d, and f orbitals.
The only example of one of these types of orbitals being filled in violation of Madelung's rule is in lawrencium.
p orbital(s)