'Signet' in the Bible

It was while she was being brought out that she sent to her father-in-law, saying, “I am with child by the man to whom these things belong.” And she said, “Please examine and see, whose signet ring and cords and staff are these?”

Then Pharaoh took off his signet ring from his hand and put it on Joseph’s hand, and clothed him in garments of fine linen and put the gold necklace around his neck.