This is the regular {4,3,6} honeycomb in hyperbolic 3-space. The model is cell-centered in the Poincaré Ball model, with the viewpoint then placed at the ball origin.
<a href="//commons.wikimedia.org/wiki/User:Roice3" title="User:Roice3">Roice3</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>