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This technical reference entry illustrates the sophisticated geometry of an ancient Roman decorative medallion (translated from the Latin clipeus to denotes a circular parade shield or architectural roundel), widely utilized across the Roman Empire as an apotropaic boundary marker or wall attachment to ward off evil spirits. The composition is structured by a sequence of tightly packed concentric rings that lead the eye toward an intricate outer border band etched with a traditional continuous Greek key or meander pattern. Anchored directly in the center of the shield face is a highly stylized carving of a Gorgoneion, depicting the fearsome face of Medusa with wide, staring concentric eyes, a rigid nose, and a furrowed brow flanked by wild, knotted hair strands that transform into a pair of outspread wings or horns atop her head. This specific defensive and decorative motif was extensively replicated on bronze soldier armor, public temple friezes, and grand atrium wall mosaics across ancient Italy, leveraging the mythological power of the slain monster to symbolically blind enemies and petrify intruders who gazed directly upon the sacred household or military installation.