ORB, a circle or ring (Lat. orhis), hence a globe or disk or other spherical object. It is thus used, chiefly poetically, of any of the heavenly bodies, including the earth itself (Lat. orbis terrarum), or of the eye-baU or eye. The " orb," also known as the "mound" (Lat. mundus, "world"), consisting of a globe surmounted by a cross, forms part of many regalia, being a symbol of sovereignty (see Regalia). In architecture the meaning to be attached to the word " orb " is doubtful. It is usually now taken to mean properly a blank or bUnd window, and thence a blank panel. If so the word represents Lat. orbus, " bereft of," " orphaned," fenestra orba luminis. It is also identified with a circular boss conceahng the intersection of arches in a vault.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)