FH	Frankfort horizontal plane	Plane built from the line joining porion (Po) and orbital (Or) points
Co-A	Maxillary length	Distance in mm between condylion (Co) and subspinal (A) points
ANS-PNS	Maxillary length	Distance in mm between the anterior nasal spine (ANS) and the posterior nasal spine (PNS) points
Co-Gn	Mandibular length	Distance in mm between condylion (Co) and gnation (Gn) points.
SNA	Antero-posterior position of the maxilla	Angle formed by nasion (N), sella (S) and subspinal (A) points
SNB	Antero-posterior position of the mandible	Angle formed by nasion (N), sella (S) and supramental (B) points
ANB	Antero-posterior relation between the maxilla and the mandible	Angle formed by subspinal (A), nasion (N) and supramental (B) points
N-A ┴ FH	Antero-posterior position of the maxilla	Distance in mm between a line perpendicular to FH plane at nasion (N) point and subspinal (A) point.
N-Pog ┴ FH	Antero-posterior relation of the mandible	Distance in mm between a line perpendicular to FH plane at nasion (N) point and pogonion (Pog) point
FMA	Mandibular plane angle	Angle formed between the mandibular plane and FH plane Mandibular plane: Line joining gnation (Gn) and menton (Me) points
N-Ba/Ptm-Gn	Facial axis angle	Angle formed between the line joining basion (Ba) and nasion (N) points and the line joining sella (S) and gnation (Gn) points
N-ANS ┴ FH	Upper anterior face height	Distance in mm between nasion (N) and anterior nasal spine (ANS) points measured perpendicular to the FH plane
ANS-Me ┴ FH	Lower anterior face height	Distance in mm between anterior nasal spine (ANS) point and menton (Me) point measured perpendicular to the FH plane
I/SN	Upper incisor angulation	Angle between the long axis of the most anterior upper incisor and the line joining sella (S) and nasion (N) points
OB	Overbite	Vertical distance in mm from the tip of the lower incisor to the tip of the upper incisor
OJ	Overjet	Horizontal distance in mm from the labial of the lower incisor to the labial of the upper incisor
PNS-U	Soft palate length	Distance in mm between posterior nasal spine (PNS) and uvula (U) points
PAS mid.	Posterior airway space at oropharynx level	Shortest distance in mm between the soft palate and the posterior wall of the pharynx
PAS inf.	Posterior airway space at laryngopharynx level	Shortest distance in mm between the base of the tongue and the posterior wall of the pharynx