Answer:
The shape of an orbital
Explanation:
The orbital angular momentum quantum number l defines the shape of an orbital.
l = 0: s orbital — spherical
l = 1: p orbital — two lobes, pointing along a Cartesian axis
l = 2: d orbital — four lobes, pointing toward the corners of a square
l = 3: f orbital — eight lobes, pointing toward the corners of a cube
