capital
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Capital is the decorative top section of a column that sits between the column's shaft and the structure it supports. It matters because it distributes the weight from above while serving as an important architectural detail that defines different building styles and periods.
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In architecture, the capital (from Latin caput 'head') or chapiter forms the topmost member of a column (or a pilaster). It mediates between the column and the load thrusting down upon it, broadening the area of the column's supporting surface. The capital, projecting on each side as it rises to support the abacus, joins the usually square abacus and the usually circular shaft of the column. The capital may be convex, as in the Doric order; concave, as in the inverted bell of the Corinthian order; or scrolling out, as in the Ionic order. These form the three principal types on which all capitals in the classical tradition are based.
The Composite order was formalized in the 16th century following Roman Imperial examples such as the Arch of Titus in Rome. It adds Ionic volutes to Corinthian acanthus leaves.