# Are angular nodes necessarily planes?

Angular nodes are determined by finding what $l$ corresponds to the orbital you are looking at.
For example, a $3 d$ orbital has $l = 2$, so it has two angular nodes. These happen to usually be nodal planes. For a $3 {d}_{x y}$ orbital, these are the $x z$ and $y z$ planes.
However, for the $3 {d}_{{z}^{2}}$ orbital, the two angular nodes correspond to the two conical nodes: the top half and the bottom half (these are at around ${54.74}^{\circ}$ from the $z$ axis).