Line of Authority
“Every priesthood holder should be able to trace his ‘line of authority’ back to Jesus Christ. This means he should know who ordained him and who ordained the person who ordained him, and so on back to Joseph Smith, who was ordained by Peter, James, and John, who were ordained by Jesus Christ. This is called the ‘priesthood line of authority’’’ (The Latter-day Saint Woman, Part A, p. 77). Members of the priesthood carry cards, called “line of authority cards,” which contain this information.