U+229F • symbol
Squared minus (⊟) denotes a binary subtraction operation enclosed in a square, used in mathematical and logical contexts to represent specialized difference operations. It differentiates this operation from standard subtraction by its squared notation.
The Symbol For Squared Minus (⊟) 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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