a stone or wooden slab, generally taller than it is wide, erected for funerals or commerative purposes, most usually decorated with the names and titles of the deceased or living

Books of the Dead were very important books/ scrolls that were buried with people. The more important you were, the bigger your book would be. The books contained spells that would help the person in the afterlife. Today, these “spells” would be more like prayers or wishes for the dead.