What does Cain, mark of mean?

Cain, mark of meaning in Medical Dictionary

The mark that God set upon Cain, the oldest child of Adam. According to the Book of Genesis in Bible, God refused Cain's grain providing while accepting the pet supplying of their brother Abel. Off jealousy, Cain murdered his sibling and was compelled by Jesus to roam the planet earth as "a fugitive and a vagabond." Lest some one slay Cain and end his distress, " the father put a mark on Cain."