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Lift Coefficient ($C_l$)

The coefficient of lift, derived from the Kutta-Joukowski theorem: Cl=2π(α−α0)C_l = 2\pi (\alpha - \alpha_0), where α\alpha is the angle of attack.
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The statement of the theorem

Define the lift coefficient ClC_l based on the angle of attack α\alpha (in radians) using the linearized relationship derived from the Kutta-Joukowski theorem: Cl=2π(α−α0)C_l = 2\pi (\alpha - \alpha_0) where α0\alpha_0 is the zero-lift angle of attack.
Source: Wikipedia