It could also refer to the staff of Moses as mentioned in Exodus Chapter 4
And the Lord said unto him, What is that in thine hand? And he said, A rod.
3 And he said, Cast it on the ground. And he cast it on the ground, and it became a serpent; and Moses fled from before it.
4 And the Lord said unto Moses, Put forth thine hand, and take it by the tail. And he put forth his hand, and caught it, and it became a rod in his hand:
5 That they may believe that the Lord God of their fathers, the God of Abraham, the God of Isaac, and the God of Jacob, hath appeared unto thee.