A fleuron in architecture

Architecture

Architecture is both the process and product of planning, designing and construction. Architectural works, in the material form of buildings, are often perceived as cultural and political symbols and as works of art...

 may have a number of meanings. It is a collective noun for the ornamental termination at the ridge of a roof

Roof

A roof is the covering on the uppermost part of a building. A roof protects the building and its contents from the effects of weather. Structures that require roofs range from a letter box to a cathedral or stadium, dwellings being the most numerous....

 such as a crop, finial

Finial

The finial is an architectural device, typically carved in stone and employed decoratively to emphasize the apex of a gable or any of various distinctive ornaments at the top, end, or corner of a building or structure. Smaller finials can be used as a decorative ornament on the ends of curtain rods...

 or épi

EPI

The prefix epi, or ep if followed by a vowel or the letter "h", is derived from the Greek preposition ἐπί meaning: above, on, over, nearby, upon; outer; besides, in addition to; among; attached to; or toward....

. It is also a form of stylised late gothic decoration in the form of a four-leafed square, often seen on crocket

Crocket

A crocket is a hook-shaped decorative element common in Gothic architecture. It is in the form of a stylised carving of curled leaves, buds or flowers which is used at regular intervals to decorate the sloping edges of spires, finials, pinnacles, and wimpergs....

s and cavetto mouldings

Molding (decorative)

Molding or moulding is a strip of material with various profiles used to cover transitions between surfaces or for decoration. It is traditionally made from solid milled wood or plaster but may be made from plastic or reformed wood...

. It can be the ornament in the middle of each concave face of a Corinthian abacus. Finally it can be a form of Anthemion, the decorative Greek floral decoration.