U+2201 • set-theory
The complement symbol (∁) representing the complement of a set, typically meaning all elements not in the given set within a universal set. It is used in set theory and related mathematical contexts to denote the complement operation.
The Symbol For Complement (∁) 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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