Finial n. (Arch.) The knot or bunch of foliage, or foliated ornament, that forms the upper extremity of a pinnacle in Gothic architecture; sometimes, the pinnacle itself.
... the sculptures seemed to serve as resting-places for their nests, and every hollow in the stone where the rain-water collected was a miniature lake where the birds came to drink; sometimes a large black bird would settle on one of the pinnacles like an unexpected finial; it was a raven who settled there to plume his wings, and it would remain there sunning itself for hours; to the people who saw it from below it appeared about ... — The Shadow of the Cathedral • Vicente Blasco Ibanez