e/Zonal spherical harmonics

Information
has gloss	eng: In the mathematical study of rotational symmetry, the zonal spherical harmonics are special spherical harmonics that are invariant under the rotation through a particular fixed axis. The zonal spherical functions are a broad extension of the notion of zonal spherical harmonics to allow for a more general symmetry group.
lexicalization	eng: zonal spherical harmonics
instance of	c/Special hypergeometric functions