U+2254 • definition
The 'Colon Equals' symbol (≔) is used to denote definition, meaning that the expression on the left is defined to be the expression on the right. It is common in mathematics, logic, and programming to introduce new terms or functions.
The Symbol For Colon Equals (≔) 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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