ANB

The angle formed by the intersection of the point A to N (nasion) line and the point B to N (nasion) line (Figure 1)

β angle

A perpendicular is dropped from point A to a line drawn from C (center of condyle) to point B. β angle is the angle between this perpendicular and the AB line (Figure 2)

YEN angle

Angle between the S (sella) to M (center of the premaxilla) line and the M to D (center of the symphysis) line (Figure 3)

W angle

A perpendicular is dropped from M to the SD line. W angle is measured between this perpendicular and the MD line (Figure 4)

APDI

(NPgFH plane) ± ( NPgAB) ± (FHpalatal plane) (Figure 5)

Wits appraisal

Distance between the projection of point A and point B on the occlusal plane (Figure 6)

AppBpp

Distance between the projection of point A and point B on the palatal plane (Figure 6)
