Trachelium is the term 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...

 given to the neck of the capital of the Doric

Doric order

The Doric order was one of the three orders or organizational systems of ancient Greek or classical architecture; the other two canonical orders were the Ionic and the Corinthian.-History:...

 and Ionic order

Ionic order

The Ionic order forms one of the three orders or organizational systems of classical architecture, the other two canonic orders being the Doric and the Corinthian...

s. In the Greek Doric capital it is the space between the annulets of the echinus

Echinus

Echinus may refer to:* Mallotus , synonym for a genus of the plant* Echinus , a genus of animals* Echinus , a window manager* Molding , similar to the ovolo molding...

 and the grooves which marked the junction of the shaft and capital; in some early examples, as in the basilica

Basilica

The Latin word basilica , was originally used to describe a Roman public building, usually located in the forum of a Roman town. Public basilicas began to appear in Hellenistic cities in the 2nd century BC.The term was also applied to buildings used for religious purposes...

 and temple of Ceres at Paestum

Paestum

Paestum is the classical Roman name of a major Graeco-Roman city in the Campania region of Italy. It is located in the north of Cilento, near the coast about 85 km SE of Naples in the province of Salerno, and belongs to the commune of Capaccio, officially also named...

 and the temple at Metapontum

Metapontum

Metapontum, Metapontium or Metapontion , was an important city of Magna Graecia, situated on the gulf of Tarentum, between the river Bradanus and the Casuentus . It was distant about 20 km from Heraclea and 40 from Tarentum...

, it forms a sunk concave moulding, which by the French

France

The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

 is called the gorge. In the Roman Doric and the Ionic orders the term is given by modern writers to the interval between the lowest moulding of the capital and the top of the astragal and fillet, which were termed the hypotrachelium

Hypotrachelium

In classical architecture, the hypotrachelium is the space between the annulet of the echinus and the upper bed of the shafts, including, according to C. R. Cockerell, the three grooves or sinkings found in some of the older examples, as in the temple of Neptune at Paestum and the temple of Aphaea...

.