A finial or hip-knob is an element marking the top or end of some object, often formed to be a decorative feature.
Finial of the dome of the Taj Mahal
Kalasha finials on top of a gopuram
A slate roof in Syrrako (Greece), built with a curved valley layout and finials on top.
French Imperial Eagle finial on a regiment banner of the Grande Armée
A crocket is a small, independent decorative element common in Gothic architecture. The name derives from the diminutive of the Old French croc, meaning "hook", due to the resemblance of a crocket to
Finial
…Alem (finial) Crocket Chigi (architecture…
Crocketed spire of the Notre-Dame Church in Vitré, France
A finial with several crockets, at Gore Hall, Harvard University
Crocket capitals on Laon Cathedral
A 20th century crocketed gable on Nidaros Cathedral, Trondheim