'Sign' in the Bible

Then the iron and the earth, the brass and the silver and the gold, were smashed together, and became like the dust on the floors where grain is crushed in summer; and the wind took them away so that no sign of them was to be seen: and the stone which gave the image a blow became a great mountain, covering all the earth.

Now, O king, establish the decree, and sign the writing, that it be not changed, according to the law of the Medes and Persians, which altereth not.

So they approached the king and asked about his edict: “Didn’t you sign an edict that for 30 days any man who petitions any god or man except you, the king, will be thrown into the lions’ den?”The king answered, “As a law of the Medes and Persians, the order stands and is irrevocable.”

In the morning, at the earliest sign of daylight, the king got up and rushed to the lions' den.