His Jewel of office is an opened book, symbolizing the Volume of Sacred Law (the Christian Bible, Hebrew Torah or Tanach, the Muslim Qur’an, the Hindu Vedas or other Holy Books).

The Chaplain of a Masonic Lodge is an appointed officer of the Lodge.  He sits to the left of the Master. 

The Chaplain is the spiritual leader of the Lodge.  While he may or may not be a real-world Minister, Priest, Rabbi or Imam,… in the lodge, the Chaplain is responsible for non-denominational prayers at both the opening and closing of meetings, during degree ritual ceremonies and before meals.   

Read more: http://www.masonic-lodge-of-education.com/lodge-officer-duties.html#ixzz4CKWEKDV4