A book symbol on a tombstone usually represents the Holy Bible or the Book of Life.
Most often the words Holy Bible are not inscribed on the book, although any book on a tombstone may be considered a Bible.
An open book may indicate the Book of Life and everlasting life for those whose names are written in it.
A closed book may indicate that life has ended. Life is completed.
A book symbol may symbolize the deceased’s faith or prayer.
The whole cemetery monument may be a Bible.
A book symbol may indicate the deceased was a scholar, writer, or publisher, but the symbol most often has a religious connotation.