What is caput quadratum?

Caput quadratum is a Latin term that means "square head". It is a term commonly used in architecture to describe a style of decoration used on the top of columns or pilasters. The caput quadratum is a square block that sits on top of the column or pilaster capital and provides a stable base for a weight-bearing structure. It is often seen in ancient Greek and Roman architecture, and its simplicity and strength have made it a popular design choice through the centuries. The caput quadratum can be made of a variety of materials, including stone, marble, and wood, and can be adorned with a variety of decorative elements such as rosettes, wreaths, or acanthus leaves.