prohibition sign
sign indicating of what kinds of activities are allowed or disallowed in a place; red circle with a red diagonal line, indicating something is not permitted
en-GB/ˌpɹəʊɪˈbɪʃn ˈsaɪn/
en-US/ˌpɹoʊəˈbɪʃən ˈsaɪn/
sign indicating of what kinds of activities are allowed or disallowed in a place; red circle with a red diagonal line, indicating something is not permitted