- (of a polygon) hornpunktur, oddpunktur
- (of a cone or pyramid) topppunktur, broddur, tindur, toppur
= apex - (of a conic section) hvirfilpunktur
-> secondary vertex, vertex 5 - (of a graph) hnútur, punktur
= node 3 - (of a plane curve) hvirfilpunktur
-> four-vertex theorem, vertex 3 - (of a ray) upphafspunktur
-> initial point - (of an angle) oddpunktur, topppunktur, broddur
- (of an isosceles triangle) topppunktur