In essence, these considerations also show that the fresh minds of young NMR spectroscopists get inoculated with rather fuzzy and essentially faulty terminology. This discrepancy between teaching, theory, and practice has been discussed at length by Szantay . This can explain why, over five decades following the establishment of NMR spectroscopy as a routine analytical technique in chemistry, confusion about proper NMR terminology infects the scientific literature and community. Therefore, one outcome of the present study is the notion that peak or line frequency differences are not coupling constants, but just peak or line frequency differences. Rather, coupling constants are intrinsic physical properties of the resonating nuclei and, therefore, parameters for the QM calculations of spin systems, which do not necessarily follow the first-order n+1 rule (for 1 H). Importantly, while a relationship does exist between the coupling constants and the resonances of individual nuclei, peak/line frequency differences in observed NMR spectra may(!) resemble coupling constants more or less closely, but also may not.