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The Geometrical meaning of the second derivative is the curvature of the function. If the function has zero second derivative it is straight or flat.
It is a geometrical construction
point is also known as dot.
The first derivative is the rate of change, and the second derivative is the rate of change of the rate of change.
The cross product can be said to be a measure of the 'perpendicularity' of the vectors in the product. Please see the link.