mark of cain, n.All

Mark of Cain (n.) is ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠the first differential system: God answers the founding murder with a law against murder and a sign that keeps rivalry at bay.