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X-ray notation is a method of labeling atomic orbitals that grew out of X-ray science.
If the molecule has some symmetry, the degenerate atomic orbitals (with the same atomic energy) are grouped in linear combinations (called symmetry-adapted atomic orbitals (SO)), which belong to the representation of the symmetry group, so the wave functions that describe the group are known as symmetry-adapted linear combinations (SALC).
Within a particular representation, the symmetry-adapted atomic orbitals mix more if their atomic energy levels are closer.