In vector calculus I understand how div is kind of a measure of how much a point acts as a source or sink of the field lines or a measure of the flux through a closed shape at a point in a sense. The curl is a measure of how much rotation the surrounding vector field causes at a point (Please correct if this is wrong).
Just wanted to know if there was also a geometric meaning for the triple product ∇ · (∇ × a). I cant seem to reason it out.