U+2237 • mathematics
The proportion symbol (∷) used in mathematics to denote that two ratios or fractions are in proportion. It expresses equality of two ratios or a proportional relationship.
The Symbol For Proportion (∷) is a unicode character in the Basic Multilingual Plane Plane. It is found in the Mathematical Operators block and was approved as part of Unicode Version 1.1 in 1993
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