'Shekels' in the Bible

When he cut the hair of his head (for at the end of each year he cut it, because its weight was heavy on him) he weighed the hair of his head at 200 shekels by the king’s weight.

Joab said to the man who informed him, “You saw him! Why then did you not strike him there to the ground? I would have given you ten pieces of silver and a belt.”

Then Ishbi-benob, who was among the descendants of the giant, the weight of whose spear was three hundred shekels (six pounds) of bronze, was armed with a new sword, and he intended to kill David.

But the king said to Araunah, “No, but I will certainly buy it from you for a price. I will not offer burnt offerings to the Lord my God which cost me nothing.” So David purchased the threshing floor and the oxen for fifty shekels of silver.