Two three dimensional vectors can be multiplied to make a vector that is perpendicular to both. This is the Cross Product, and it only makes sense in three dimensions.
Enter the two vectors, the first in A: and the second in B:.
It is important to put the first one in A, since
Now click on 
. The answer appears in the lower middle of
the window.
You can do calculations with the result by moving the answer to the
left side 
or to the right side 
.
Cross-product is quite different from Dot-Product and Scalar Product.