What does the word "display mean in math?
As in any area, a "display" involves posters orsets of posters about the topic.
http://www.sparklebox.co.uk/gallery/maths/
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.
I hope this helps. Thanks for asking.