The document summarizes the key characteristics of three classical Greek architectural orders - Doric, Ionic, and Corinthian. The Doric order has columns 6-7 times the lower diameter without a base. It has 20 flutes and a capital with an abacus and echinus. The Ionic order is 9 times the diameter with a two-part base and 24 flutes. It is known for its distinctive volute capital. The Corinthian order is 10 times the diameter with a two-part Ionic-style base, 24 flutes, and a unique capital decorated with acanthus leaves.