It's hard to interpret the result of half-measures.
Those are spats.
As for the dinky little ones, see
Gurney flap
Quote:
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The Gurney Flap (or wickerbill) is a small tab projecting from the trailing edge of a wing. Typically it is set at a right angle to the pressure side surface of the airfoil,[1] and projects 1% to 2% of the wing chord.[2] This trailing edge device can improve the performance of a simple airfoil to nearly the same level as a complex high-performance design.[3]
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...or vortex generator.
