Diagram of a Traditional Column and Post

1. The Capital is a decorative element at the top of the column or post. The Abacus is the widest dimension where the capital meets the header or ceiling.

2. The Astrigal or neck ring is the moulding near the top of the shaft—typically 3" or 4" below the capital.

3. The Shaft is the portion of the column or post between the capital and base.

4. The Base is the decorative element at the bottom of a column or post. The portion of the base resting on the ground is call the Plinth.