'Signed' in the Bible

Then on the thirteenth day of the first month, the king's scribes were sent for, and they put in writing Haman's orders to all the king's captains and the rulers of every division of his kingdom and the chiefs of every people: for every division of the kingdom in the writing commonly used there, and to every people in the language which was theirs; it was signed in the name of King Ahasuerus and stamped with the king's ring.

So now send a letter about the Jews, writing whatever seems good to you, in the king's name, and stamping it with the king's ring: for a writing signed in the king's name and stamped with the king's ring may not be changed.

And Daniel, on hearing that the writing had been signed, went into his house; (now he had windows in his room on the roof opening in the direction of Jerusalem;) and three times a day he went down on his knees in prayer and praise before his God, as he had done before.

Then they made answer and said before the king, Daniel, one of the prisoners of Judah, has no respect for you, O King, or for the order signed by you, but three times a day he makes his prayer to God.