Rector Orbis

 

From the Papal Coronation rite:

Accipe tiaram tribus coronis ornatam, et scias te esse Patrem Principum et Regum, Rectorem Orbis, in terra Vicarium Salvatoris Nostri Jesu Christi, cui est honor et gloria in sæcula sæculorum.

Receive the tiara adorned with three crowns and know that thou art Father of Princes and Kings, Ruler of the World, Vicar of Our Savior Jesus Christ in earth, to whom is honor and glory in the ages of ages.

The term rector in the widest ecclesiastical sense means "one who sets straight, guides, directs; a ruler, governor, director, guide, leader".

Orbis - of the World

Supreme Governor, Legislator of the World. He who can judge and define the law and  cannot be judged by anyone, except God Himself.