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orb.
1. Globe surmounted by a cross, an emblem of power and sovereignty, often placed on top of the lantern of a cupola, pinnacle, or spire.

2. Spherical termination or finial on a pedestal or pier.

3. Circular knot of flowers or herbs (boss) fixed at the intersection of ribs in a Gothic vault, serving to conceal the junction of the mouldings and act as an abutment to them.

4. Medieval term for a blind panel in tracery, especially in Perpendicular work.

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