15 of40 Symmetrical and Asymmetrical Airfoils Training
  Airfoil shapes can be symmetrical or asymmetrical, too.

Some airfoils are curved differently on the top side than on the bottom. Those airfoils are asymmetrical, because their two sides are differently shaped. Other airfoils are shaped the same on both sides, so they're symmetrical.
Curved and non-curved airfoils
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