An upright, rectangular, flattened, often decorative projection from a wall that reflects the Doric order. Generally, it is a stoutly proportioned column with a simple, round capital.

An upright, rectangular, flattened, often decorative projection from a wall that reflects the Ionic order. Generally, it is a more slender column, and its capitals are recognized by two scrolling volutes.

An upright, rectangular, flattened, often decorative projection from a wall that reflects the Corinthian order. Generally, it is the most slender column of all the orders, and its capital is the most ornate, with layers of stylized acanthus leaves.