Aerodynamic angle of incidence. Diagram shown end on view of wing.
Users <a href="https://en.wikipedia.org/wiki/User:IMeowbot" class="extiw" title="en:User:IMeowbot">IMeowbot</a>, <a href="https://en.wikipedia.org/wiki/User:Theresa_knott" class="extiw" title="en:User:Theresa knott">Theresa knott</a> on <a class="external text" href="https://en.wikipedia.org">en.wikipedia</a>; Remade to SVG by <a href="//commons.wikimedia.org/wiki/User:Petr_Dlouh%C3%BD" title="User:Petr Dlouhý">User:Petr Dlouhý</a>
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Original version drawn by Theresa Knott