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This paper provides a history of the radiation warning sign with a focus on the period from 1946 to 1948. It employs previously unpublished material from the University of California Radiation Laboratory's Health Chemistry Group, the memoirs of John Gifford, and an account by George Warlick. Also considered is an alternative version of the sign's origin described by Cyrill Orly. This paper provides a history of the radiation warning sign with a focus on the period from 1946 to 1948. It employs previously unpublished material