Domini est terra, et plenitudo ejus; orbis terrarum, et universi qui habitant in eo, "The earth is the Lord's and the fulness thereof: the world, and all they that dwell therein." – Psalm 23(24):1
In the verse above, the Latin orbis terrarum translates the Septuagint's οἰκουμένη, which means the whole inhabited earth. English translations, even Douay's, usually render it simply as "the world," but it literally means "the circle of the lands." Medieval art in the West expressed God's rule over that circle by means of the orb symbol. Usually the orb is divided in half by a horizontal line, with a vertical line bisecting the upper half. As in medieval mappae mundi, the horizontal line represents the Mediterranean and the vertical is for the Nile. A cross is usually placed atop the orb.
The orb is common in portrait images of the Father (first picture at right), of Christ as ruler (second picture at right), or of the Trinity (example). The Christ Child will also often be pictured with the orb, especially in images of the Madonna and Child or St. Christopher (example).
The orb was also adopted by secular rulers to assert the extensiveness and Christian identity of their realms. Thus a saint who was a king may be pictured holding an orb (example), but with that exception orbs are not for mere saints.
In Garofalo's The Old and New Testaments an impressively sized orb (without the horizontal and vertical lines) is held by Ecclesia, the Church personified.
Prepared in 2021 by Richard Stracke, Emeritus Professor of English, Augusta University.