Abbreviation

Reference point

Definition

C

Columella

Most anterior point of the columella

Sn

Subnasale

Midpoint at the junction of the lower edge of the nasal septum and the upper lip

Ls

Labiale superius

Midpoint at the beginning of the vermillion of the upper lip

Cph [r], Cph [l]

Crista philtri

On each raised edge of the filter, above the upper vermilion line

Ch [r], Ch [l]

Cheilion

Lip commissure

Sto

Stomion

Intercession of facial midline and horizontal cleft lip

Li

Labiale inferius

Midpoint at the beginning of the lower lip vermilion

Sl

Sublabiale

In the midline of the nasolabial fold

Pg

Pogonion

Most anterior point of the chin