An "Architectural Order" refers to a style of classical architecture characterized by specific design elements and proportions. The three main orders are Doric, Ionic, and Corinthian, each distinguished by their columns and entablatures. These orders originated in ancient Greece and were later adopted and adapted by the Romans. Each order has unique features: the Doric order is sturdy and simple, the Ionic order is more slender with scroll-like volutes, and the Corinthian order is the most ornate, featuring elaborate acanthus leaves. These architectural styles have influenced many buildings throughout history, shaping the aesthetics of Western architecture.