A Vector is a quantity that has magnitude and direction that is commonly represented by a directed line segment whose length represents the magnitude and whose orientation in space represents the direction. Generally, a vector is  an element of a vector space.

vCalc's Vector library  contains basic vector mathematics demonstrating vectors in 2D and 3D.  The functions for 2D vectors use `vecA` and `vecB`.  The functions for 3D vectors use `vecU`, `vecV`, and `vecW`.

The convention of an arrow over the name, as in `vecV` indicates a vector quantity.  A hat over the name, as in `hatV`, implies a unit vector.