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On Classical columns, there is an ovolo under the abacus. When this is decorated with egg-and-dart or egg-and -anchor it is called an echinus. In modern times, the ovolo is often called an echinus even when there is no design.

Parthenon - Acropolis - Greece
Delphi - Greece (400 B.C.)
Brighton - England
Riga - Latvia
St. Peter's - Rome - Italy
Vicenza - Italy
Winchester - England