'Rod' in the Bible

Which shall it be? Shall I come to you with a rod, or in a loving and tender spirit?

This had a censer of gold, and the ark of the Covenant lined with gold and completely covered with gold, and in it were a gold vase which held the manna, and Aaron's rod which budded and the tables of the Covenant.

And he shall be their shepherd, ruling them with a rod of iron, just as earthenware jars are broken to pieces; and his power over them shall be like that which I Myself have received from My Father;

Then a reed was given me to serve as a measuring rod; and a voice said, "Rise, and measure God's sanctuary--and the altar--and count the worshipers who are in it.

The plan of the city is a square, the length being the same as the breadth; and he measured the city furlong by furlong, with his measuring rod--it is twelve hundred miles long, and the length and the breadth and the height of it are equal.