This figure shows the Kagome lattice, a two-dimensional periodic geometric structure. The triangles are equilateral.
<a href="//commons.wikimedia.org/wiki/User:WilliamSix" title="User:WilliamSix">WilliamSix</a>
CC BY-SA 2.5
<span class="int-own-work" lang="en">Own work</span>