'Shekels of Silver' in the Bible

and they shall fine him a hundred shekels of silver and give it to the father of the young woman, because he publicly defamed a virgin of Israel. And she shall remain his wife; he is not allowed to divorce her as long as he lives.

then the man who was intimate with her shall give fifty shekels of silver to the girl’s father, and she shall become his wife because he has violated her; he can never divorce her.