Rotor blade with <a href="https://en.wikipedia.org/wiki/Chevron_(aeronautics)" class="extiw" title="en:Chevron (aeronautics)">chevrons</a> (saw tooth patterns on the trailing edge) of an <a href="https://en.wikipedia.org/wiki/Enercon" class="extiw" title="en:Enercon">Enercon</a> <a href="https://en.wikipedia.org/wiki/Wind_turbine" class="extiw" title="en:Wind turbine">wind turbine</a> at <a href="https://en.wikipedia.org/wiki/Rot_am_See" class="extiw" title="en:Rot am See">Rot am See</a>
<a href="//commons.wikimedia.org/wiki/User:Michael32710" title="User:Michael32710">Michael32710</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>