'Signet' in the Bible

The king removed his signet ring from his finger and gave it to Haman son of Hammedatha the Agagite, the enemy of the Jewish people.

The royal scribes were summoned on the thirteenth day of the first month, and the order was written exactly as Haman commanded. It was intended for the royal satraps, the governors of each of the provinces, and the officials of each ethnic group and written for each province in its own script and to each ethnic group in its own language. It was written in the name of King Ahasuerus and sealed with the royal signet ring.

The king removed his signet ring he had recovered from Haman and gave it to Mordecai, and Esther put him in charge of Haman’s estate.

You may write in the king’s name whatever pleases you concerning the Jews, and seal it with the royal signet ring. A document written in the king’s name and sealed with the royal signet ring cannot be revoked.”

Mordecai wrote in King Ahasuerus’s name and sealed the edicts with the royal signet ring. He sent the documents by mounted couriers, who rode fast horses bred from the royal racing mares.