Finial

n. (Architecture) small ornamental object at the top of a column (or gable, etc.); ornamental knob

The finial is an architectural device, typically carved in stone and employed to decoratively emphasise the apex of a gable, or any of various distinctive ornaments at the top, end, or corner of a building or structure. Smaller sized finials can be used as a decorative ornament on the ends of curtain rods or applied to chairs and furniture. These are frequently seen on top of bed posts or clocks. Decorative finials are also commonly used to fasten lampshades, and as an ornamental element at the end of the handles of souvenir spoons.
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Noun
1. an ornament at the top of a spire or gable; usually a foliated fleur-de-lis
(hypernym) decoration, ornament, ornamentation

n. (Architecture) finial, small ornamental object at the top of a column

A turned or carved ornament used to embellish furniture.