Point <i>T</i>  is the <a href="https://en.wikipedia.org/wiki/Centre_(geometry)" class="extiw" title="w:Centre (geometry)">center</a> of this hexagon:  the center of its <a href="https://en.wikipedia.org/wiki/Circumscribed_circle" class="extiw" title="w:Circumscribed circle">circumcircle</a>, and the center of the <a href="https://en.wikipedia.org/wiki/Point_reflection" class="extiw" title="w:Point reflection">point reflection</a> that transforms the hexagon into itself, as well as <a href="https://en.wiktionary.org/wiki/regular_polygon" class="extiw" title="wiktionary:regular polygon">the regular</a> hexagon which shares all its <a href="https://en.wiktionary.org/wiki/vertices" class="extiw" title="wiktionary:vertices">vertices</a> with it.<br> 
<a href="//commons.wikimedia.org/wiki/User:Baelde" title="User:Baelde">Baelde</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>