The dot product of two vectors A and B (written A⋅B, and pronounced "A dot B ") is defined to be the product of their magnitudes, tim...The dot product of two vectors A and B (written A⋅B, and pronounced "A dot B ") is defined to be the product of their magnitudes, times the cosine of the angle between them: It turns out that this combination occurs frequently in physics; the dot product is related to the projection of one vector onto the the other.