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It combines semaphore signals for 'N' (nuclear) and 'D' (disarmament) within a circle.
When turned upside down -- it has been said to represent a coward in that it resembles a chicken’s foot -- a derogatory sign for antiwar activists or those who refused to join the military during the Vietnam war -- also known as a pro-war tattoo.
Also, very publicly worn by James Baldwin when he interviewed on the Dick Cavette show in 1968 -- discussing rampant racism in America.
