As Pope, his rarely used full title was:His Holiness Benedict XVI, Bishop of Rome, Vicar of Jesus Christ, Successor of the Prince of the Apostles, Supreme Pontiff of the Universal Church, Primate of Italy, Archbishop and Metropolitan of the Roman Province, Sovereign of the Vatican City State, Servant of the servants of God.The best-known title, that of "Pope", does not appear in the official list of titles, but is commonly used in the titles of documents, and appears, in abbreviated form, in their signatures as "PP." standing for ""Papa"" ("Pope").