The seven key terms of NMR spectroscopy form a modular set that is reminiscent of the nested Matryoshka design. The definition of the seven key terms follows a logical flow that covers the generation and interpretation of NMR spectra (from left to right; not necessarily in order of granularity) and involves three types of entities: (i) Resonance, Signal, and Spectrum as observables of the physical phenomenon NMR; (ii) Pattern and Peak as visual ("phenotypical") descriptors that are to an extent heuristic and analysis dependent; (iii) Line and Transition as analytical concepts arising from QM-based analysis of the NMR phenomenon. This Matryoshka analogy is intended to emphasize the modularity and overall logic of the nomenclature. Conceptually-approaching infinite magnetic field strength-Lines will approximate Transitions, which represent the discrete frequencies that can be calculated according to a QM model of the magnetic resonance phenomenon. Considering that the QM concept of spins would be located below transitions to the right, but also is analogous to resonance, which would place them above resonance to the left, the Matryoshka modularity of NMR terminology fits strikingly with M.C. Escher's graphic art concepts (see mcescher.com).