'Shekels of Silver' in the Bible

There was a great famine in Samaria; and behold, they besieged it, until a donkey’s head was sold for eighty shekels of silver, and a fourth of a kab of dove’s dung for five shekels of silver.

Then Menahem exacted the money from Israel, even from all the mighty men of wealth, from each man fifty shekels of silver to pay the king of Assyria. So the king of Assyria returned and did not remain there in the land.