This is an equilateral triangle or biped as the base line is dotted while the two side lines are solid. This is to help the <a href="https://en.wikipedia.org/wiki/triangle_of_reference" class="extiw" title="w:triangle of reference"> triangle of reference</a> be easily adapted to various languages.
<a href="//commons.wikimedia.org/wiki/User:KYPark" title="User:KYPark">KYPark</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>