The term 'cross products' refers to the result of multiplying two or more vectors together. The term can also be used to describe the product of two or more matrices. In mathematics, a vector is an array of numbers that can be used to represent a point in space, while a matrix is a rectangular array of numbers that can be used to represent a linear transformation. The cross product of two vectors is a vector that is perpendicular to both of the original vectors. The cross product of two matrices is a matrix that contains the product of each element in the first matrix with each element in the second matrix. The four-letter word 'PENS' is an acronym for the cross product of two vectors, which is also known as the vector product.