'Signed' in the Bible

Therefore king Darius signed the writing and the decree.

When Daniel knew that the writing was signed, he went into his house (now his windows were open in his room toward Jerusalem) and he kneeled on his knees three times a day, and prayed, and gave thanks before his God, as he did before.

Then they came near, and spoke before the king concerning the king's decree: Haven't you signed an decree, that every man who shall make petition to any god or man within thirty days, except to you, O king, shall be cast into the den of lions? The king answered, The thing is true, according to the law of the Medes and Persians, which doesn't alter.

Then answered they and said before the king, That Daniel, who is of the children of the captivity of Judah, doesn't respect you, O king, nor the decree that you have signed, but makes his petition three times a day.