Dictionary.com helped me track down the word she used.
Regular Tessellations ... Regular tessellations are made up entirely of congruent regular polygons all meeting vertex to vertex. There are only three regular tessellations which use a network of equilateral triangles, squares and hexagons.
It's a sad day, in one respect, when your first grader is smarter than you.
![Wink ;)](./images/smilies/smile_wink_a_16.png)
Let's have another round of "kids say the cutest things" - there must be some particularly cute conversations happening this close to Christmas, care to share?