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9:9 ·
This structure denotes great danger. It is used by botanists to signify that a plant or part of it is very poisonous, mortal danger. The tramps and vagrants in England, Sweden, and the United States use it to mean policeman lives here or the people here call the police. The sign is often doubled in this context:  .
In a mathematical context it means not identical with (from  , identical with).
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