On our recent Wild By Design tour, while exploring Anandapur, I asked our guide about the stone slabs at the base of Expedition Everest. I'd always noticed the stones but never thought to investigate them further.
Apparently the stones are placed in honor of the living things in Anandapur, just as they would be in Nepal. Each slab depicts a different animal or script, intended as a form of respect to bless the animal. Included on the side, all alone, is a blessing for the yeti.
Our guide also mentioned that when depicting the yeti, one has to be very specific and careful in their rendering. The yeti is easily offended apparently. :)