'Shekels' in the Bible

When he shaved his head, it would happen {every year}, which he did because [it was] heavy on him, he would shave it off and weigh the hair of his head: two hundred shekels {by the king's weight}.

Then the king said to Araunah, "No, but {I will certainly buy} it from you for a price; I don't want to offer to Yahweh my God burnt offerings that cost me nothing." So David bought the threshing floor and the cattle for fifty shekels of silver.