This symbol is seen often in the Roman catacombs. The shepherd is a symbol of Jesus.  Commonly depicted standing strongly and surrounded by His sheep.  Often the symbol of the shepherd is painted and drawn carrying a lamb on His shoulders or in His arms. A famous quote of Jesus is, “I am the good shepherd. The good shepherd lays down His life for His sheep.”  Some scholars note that this symbol could be idealized as a classic figure of Mercury – but was carefully refined to hide the identity of Christ from the pagans.