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It's stubbed on the back... you want a slope to the rear. The face of an object has a negligible effect on it's aero profile compared to the rear. The idea is rounded front, sharp rear, mild angle between the two. You want the shape of an object to train flow back to a closing point, not leave it opening as the flow trips from the edge of your object.
There are plenty of resources for aerodynamics here and all over the internets.
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