U+2236 • mathematics
The ratio symbol (∶) used in mathematics to denote the ratio between two quantities. It expresses a comparative relation often read as "is to" in proportions and ratios.
The Symbol For Ratio (∶) 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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