Basic terminology (click "Geometry" in the upper left-hand view.)
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Airfoil: The wing.
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Leading edge: The forward (rounded) part of the wing.
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Trailing edge: The aft (thin) part of the wing.
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Chord: The distance between the forward and aft edge of the wing.
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Angle of attack, AOA (In the simulation, it's called Angle): The angle in degrees between the chord and direction of flight, relative to the air. At higher values of AOA, the wing is taking a bigger "bite" of the air.
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Camber: The downward curvature of the airfoil, measured as a percent of chord.
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Thickness: The maximum distance between the upper and lower surface of the airfoil, measured as a percent of chord.