s = sella; n = nasion; ss = subspinale; pg = pogonion; NSL = nasion-sella-line; NL = nasal-line; ML = mandibular-line.
Sagittal variables: sagittal jaw relation (ss-n-pg), maxillary prognathia (s-n-ss), mandibular prognathia (s-n-pg). Vertical variables: vertical jaw relation (NL/ML), maxillary inclination (NSL/NL), mandibular inclination (NSL/ML).