'Signed' in the Bible

Therefore king Darius signed the writing and the decree.

And when Daniel knew that the writing was signed, he went into his house; and, his windows being open in his upper chamber toward Jerusalem, he kneeled on his knees three times a day, and prayed and gave thanks before his God, as he did aforetime.

Then they came near, and spoke before the king concerning the king's decree: Hast thou not signed a decree, that every man that shall ask anything of any god or man within thirty days, except of thee, O king, shall be cast into the den of lions? The king answered and said, The thing is true, according to the law of the Medes and Persians, which may not be revoked.

Then they answered and said before the king, That Daniel, who is of the children of the captivity of Judah, regardeth not thee, O king, nor the decree that thou hast signed, but maketh his petition three times a day.