Lantern

In architecture, a small, often decorative structure with openings to admit light and ventilation, crowning a dome, turret, or roof. Many a great dome built in the Italian Renaissance was topped with a lantern (lanterna in Italian).Examples:Filippo Brunelleschi (Italian, 1377-1446), Lantern atop the dome of Florence Cathedral, 1420-1434. Michelangelo, Lantern atop the dome above the Medici Chapel of the Church of San Lorenzo, Florence, Italy. A view of the exterior of the lantern, and a view of the interior as seen from within the dome.Also see finial and oculus.