'Sign' in the Bible

Now, O king, establish the edict and you must sign the document [so] that [it] cannot be changed, according to [the] law of [the] Medes and Persians which cannot be revoked."

Then they approached {and spoke with the king} concerning the edict of the king, "{Did you not sign an edict} that any person who would seek [anything] from any God or human within thirty days except from you, O king, would be thrown into {the lion pit}?" The king answered and said, "The matter [as you have just stated] is certain according to [the] law of [the] Medes and Persians which cannot be revoked."