S. no	Landmark	Abbreviation	Definition on skull
1.	Nasion	N	Most anterior point of the frontonasal suture in the mid-sagittal plane
2.	A-point hard	A-point	The point at the deepest midline concavity on the maxilla between the anterior nasal spine and the dental alveolus
3.	Anterior nasal spine	ANS	Most anterior midpoint of the ANS of maxilla
4.	Posterior nasal spine	PNS	The sharp posterior extremity of the nasal crest of the hard palate
5.	B-point hard	B-point	Most posterior point in the concavity along the anterior border of the mandibular symphysis
6.	Pogonion hard	Pog/Pg	Most anterior point on mandibular symphysis
7.	Menton hard	Me	Most inferior point on the mandibular symphysis
8.	Gnathion hard	Gn	Midpoint of the curvature of the pogonion and menton
9.	Gonion left	GoL	Most inferior and posterior point on left mandibular corpus
10.	Gonion right	GoR	Most inferior and posterior point on right mandibular corpus
11.	Condylion left	CoL	Most superior point on the left mandibular condyle
12.	Condylion right	CoR	Most superior point on the right mandibular condyle
13.	R1 left	R1L	The deepest point on the curve of the anterior border of the left ramus
14.	R1 right	R1R	The deepest point on the curve of the anterior border of the right ramus
15.	Zygomatic point left	ZyL	The most lateral point on the left outline of left zygomatic arch
16.	Zygomatic point right	ZyR	The most lateral point on the right outline of right zygomatic arch
17	Sella	S	Midpoint of sella-turcica
18	C2sp	C2sp	Superiorposterior extremity of the odontoid process of C2
19	C3ai	C3ai	Most anteriorinferior point of the body of C3
20	C4ai	C4ai	Most anteriorinferior point of the body of C4