'Rod' in the Bible

I will be to him a father and he will be to me a son: if he does wrong, I will give him punishment with the rod of men and with the blows of the children of men;

And again there was war with the Philistines at Gob, and Elhanan, the son of Jair the Beth-lehemite, put to death Goliath the Gittite, the stem of whose spear was like a cloth-worker's rod.

But anyone touching them has to be armed with iron and the rod of a spear; and they will be burned with fire, every one of them.