For questions on cross products.
In mathematics, the cross product, vector product, or Gibbs' vector product is a binary operation on two vectors in three-dimensional space. It results in a vector which is perpendicular to both of the vectors being multiplied and therefore normal to the plane containing them. It has many applications in mathematics, physics, and engineering.
There is also a seven-dimensional cross product as bilinear operation on vectors in seven dimensional Euclidean space.