Julian Cope presents Head Heritage

........used by traders in the Levant during the early bronze age, where by a system of circles and lines was used to indicate if an area had been scouted out for potential custom. It made reference to things like, a circle with a broken ring meant no hostile forces, a broken inner ring meant little trade, unbroken circles meant strong defences and good trade, whilst a line running through two unbroken circles meant the area is unscouted and unknown.