# Vertex

In geometry, a **vertex** (Latin: whirl, whirlpool; plural **vertices**) is a corner of a polygon (where two sides meet) or of a polyhedron (where three or more faces and an equal number of edges meet).

In graph theory, a *graph* describes a set of connections between objects. Each object is called a node or vertex. The connections themselves are called *edges* or *arcs*.

In 3D computer graphics, a vertex is a point in 3D space with a particular location, usually given in terms of its *x*, *y*, and *z* coordinates. It is one of the fundamental structures in polygonal modelling: two vertices, taken together, can be used to define the endpoints of a line; three vertices can be used to define a planar triangle. Vertices are commonly confused with vectors because they can be described with the same properties. They are, however, two completely different things.

In anatomy, the vertex is the highest point of the skull in the anatomical position (i.e. standing upright). It lies between the parietal bones in the median sagittal plane.

In Astrology, the Vertex is a point in 3D space, seen near the Eastern horizon and the Ascendant in the (two-dimensional) starchart. Planets close to it lend their personality to the event(s) the chart captures.