'Half shekel' in the Bible

When the camels had finished drinking, the man took a gold ring weighing a half-shekel and two bracelets for her wrists weighing ten shekels in gold,

Everyone who is registered must pay half a shekel according to the sanctuary shekel (20 gerahs to the shekel). This half shekel is a contribution to the Lord.

the rich doth not multiply, and the poor doth not diminish from the half-shekel, to give the heave-offering of Jehovah, to make atonement for your souls.

[It was] a bekah for the individual, the half shekel according to the sanctuary shekel, for {everyone who was counted}, from {twenty years old} and above, for six hundred and three thousand five hundred and fifty.

And when they were come to Capernaum, they that received the half-shekel came to Peter, and said, Doth not your teacher pay the half-shekel?