Aaron's rod

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Aaron's rod

[′ar·ənz ′räd]
(architecture)
A decorative rounded molding on which are entwined a single serpent and sometimes vines and leaves.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Aaron’s rod

An ornament or molding consisting of a straight rod from which pointed leaves or scroll work emerge on either side, at regular intervals.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.