In notes concerning the circle and dot motif there are suggestions that this decoration is sometimes found on inscribed objects of the civilization around Ellora c.6th c. India. A bone amulet c.3rd c. B.C. is noted as Sonkh, Mathura and is further described as interpreted to symbolize a shield (termed 'd.ha......uh not dha guys !
With connotation as a protective device such as a shield, it is suggested that its appearance on an amulet for protection would seem plausible.
Not a great deal of detail, but interesting concept.
Best regards,
Jim