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Subnasale (Sn)
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The midpoint of the angle at the columella base where the lower border of the nasal septum and the surface of the upper lip meet
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Labrale superius (Ls)
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The midpoint of the upper vermilion line
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Cupid bow point (CBP)
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The most elevated point of the philtrum on the upper vermilion border line
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Labrale inferius (Li)
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The midpoint of the lower vermilion line
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Lower lip bow point (LLBP)
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The breakpoint on the lower vermilion border line
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Stomion (Stm)
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The point at the midline of labial fissure between gently closed lips
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Rt. Lt Stomion (Stm)
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The breakpoint on the labial fissure line between gently closed lips
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Cheilion (Ch)
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The point located at each labial commissure
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Soft tissue B point (B')
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The deepest point on the facial midline, between the lower lip and chin
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Lower incisor tip (L1)
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The midpoint of the incisal edge of the right mandibular central incisor.
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Upper lip prominent (UP)
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A line parallel to the passing Ls to Stm touched the outer most point on upper lip from lateral view
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Lower lip prominent (LP)
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A line parallel to the passing Li to Stm touched the outer most point on upper lip from lateral view
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Reference planes
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Horizontal plane
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A plane constructed with the right orbitale, the right porion, and the left porion (Frankfort horizontal (FH) plane)
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Coronal plane
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A plane constructed with the right frontozygomatic suture (FSZ) and left FZS, perpendicular to the FH plane
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Sagittal plane
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A plane constructed with nasion, perpendicular to the FH and coronal planes
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