Mandaic Amulet
From Super-wiki

Mandaic magical "demon trap" from Wikipedia.
Mandaic Amulet
An amulet is an object worn, typically around one's neck, to ward off evil or prevent injury.
Mandaic Amulets are referenced when John lists off the equipment he has gathered in preparation for his meeting with Meg.
Episodes
1.21 Salvation
John: I can handle her. I got a whole arsenal loaded. Holy water, Mandaic amulets...
Mandaic in Lore
Mandaic is an Eastern Aramaic dialect, used by followers of the Mandaean religion. It is one of the oldest Gnostic religions, and, while appearing to have Judeo-Christian roots or links, has some similarities with Zoroastrianism (also being an Iranian religion).