Tetradrachmon owl coin ring, oxidized sterling silver coin in gold-filled antefix decorated filigree silver ring. Hellenic mythology, Greek museum replicas. A filigree ring designed by Rafael Santarosa based on the ancient symbol of goddess Athena and therefore her devoted town of Athens. In the middle of a gold-filled sterling silver filigree bezel supported by two filigree antefixes nest a "Tetradrachmon" Greek Athenian coin on oxidized sterling silver. Owl is the symbol of wisdom and knowledge. In Greek mythology, a little owl (Athene noctua) traditionally represents or accompanies Athena, the virgin goddess of wisdom, or Minerva, her syncretic incarnation in Roman mythology. Because of such association, the bird—often referred to as the "owl of Athena" or the "owl of Minerva"—has been used as a symbol of knowledge, wisdom, perspicacity and erudition throughout the Western world. Owl is the bird often silver tetradrachm coin at the Archaeological Museum of the city of Athens.