It is commonly said that J coupling leads to peak splitting. Considering the first-order triplet as an example, peak splitting appears to be an accurate verbal description of the observed pattern: Jcoupling to two magnetically equivalent nuclei explains why the resonance shows three peaks with a 1:2:1 intensity ratio, thereby leading to peak splitting. However, this widespread terminology causes a major confusion as it implies that peak splitting and coupling constants are the same -which is not generally the case. In fact, it cannot be overstated that frequency differences amongst peaks are not coupling constants and vice versa. In other words, while J-coupling leads to certain splitting patterns (or peak splitting), it is not the splitting itself. This again highlights the importance of specific terminology when connecting J-couplings with peaks, splittings, and lines.