The Product of inertia about centroid (principal direction) is one of the cross section properties that is calculated by ShapeDesigner Pro software. See the full list of cross section properties calculated by ShapeDesigner Pro. Go to the ShapeDesigner product page.
More info on the "Product of inertia about centroid (principal direction)" cross section property may be found at http://en.wikipedia.org/wiki/Moment_of_inertia.
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