"The cross-product of Z scores the result of multiplying a person’s Zscore on one variable by the person’s Zscore on another variable."
Gandhi Institute of Technology and Management
"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. "