Reversed orientation of <a href="//commons.wikimedia.org/wiki/File:N_vector_positive.svg" title="File:N vector positive.svg">File:N vector positive.svg</a> corresponding to negating the exterior product.
<a href="//commons.wikimedia.org/wiki/User:Maschen" title="User:Maschen">Maschen</a>
<span class="int-own-work" lang="en">Own work</span>