Architecture

1. The act of adorning, embellishing, or honoring; ornamentation.
2. That which adorns, enriches, or beautifies; something added by way of embellishment; ornament.
3. Specifically, any mark of honor to be worn upon the person, as a medal, cross, or ribbon of an order of knighthood, bestowed for services in war, great achievements in literature, art, etc.

Ornament, in architecture, any element added to an otherwise merely structural form, usually for purposes of  decoration or embellishment. Three basic and fairly distinct categories of ornament in architecture may be recognized: mimetic, or imitative, ornaments, the forms of which have certain definite meaning or symbolic significance; applied ornament, intended to add beauty to a structure but extrinsic to it; and organic ornament, inherent in the building's function or materials.     

 

Acknowledgement :

http://www.brainyquote.com/words/de/decoration151792.html

http://www.britannica.com/EBchecked/topic/432912/ornament

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A tapering structure on top of a church tower, usually conical or pyramidal in shape. The word comes from the Old Saxon word for spear, and certainly a very slender spire might be tough to resemble a spear. One variant is a broach spire, with the spire set atop a square tower. The spire is often topped by a weather vane, flag, or cross.

Obelisk slender four-sided tapering monument, usually hewn of a single great piece of stone, terminating in a pointed or pyramidal top. Among the ancient Egyptians these monoliths were commonly of red granite from Syene and were dedicated to the sun god. They were placed in pairs before the temples, one on either side of the portal. The greatest number erected in any one place was in Heliopolis, but eventually almost every temple entrance was flanked by a pair of them. Down each of the four faces, in most cases, ran a line of deeply incised hieroglyphs and representations, setting forth the names and titles of the Pharaoh. The cap, or pyramidion, was sometimes sheathed with copper or other metal. Obelisks of colossal size were first raised in the XII dynasty.