Zero-lift coefficient of the wing (Cl0w) involves determining the lift coefficient when the angle of attack (α) is zero. This coefficient is important because it characterizes the lift generated by the wing when it is in a level flight configuration (α = 0).
Clαw is the lift curve slope of the wing.
iw means the angle of incidence is the angle.
α0Lw Zero-lift angle of attack of the wing