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Wikipedia definition
1. Therefore sign​In mathematical proof, the therefore sign (∴) is sometimes placed before a logical consequence, such as the conclusion of a syllogism. The symbol consists of three dots placed in an upright triangle and is read therefore. It is encoded at U+2234 ∴ therefore . While it is not generally used in formal writing, it is often used in mathematics and shorthand. It is complementary to U+2235 ∵ because .
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Read “∴” on Japanese Wikipedia
Read “Therefore sign” on DBpedia

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