The cross product of an ordered set of vectors V is a vector perpendicular to all vectors in V. It is only computable for a set of n-1 vectors given n-dimensional vectors. It has many odd properties, but for 3-dimensional vectors the result is n||v1||*||v2||sin(t) where t is the angle between them and n is the perpendicular unit vector. Note that axb = -bxa. See also: dot product.