Complement Symbol

A symbol from the Math Symbols collection. Click the symbol or the button below to copy.

Math Symbols collection

Symbol: ∁
Unicode: U+2201
HTML entity: ∁
Category: Math Symbols

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66 of 96 in the math symbols collection

About the complement symbol

The symbol ∁ is generally read as "complement" and represents the complement operation in set theory, where it denotes the set of all elements not belonging to a given subset within a universal set. It is also used in some mathematical contexts to indicate the complement of an angle, or in logic as a sign for negation or complementation of a relation.

How to type Complement

Native keyboard shortcuts for each operating system — derived from the codepoint, so the steps below are always accurate.

Windows

2 options

In Word / Outlook: type 2201 then press Alt + X.
Anywhere: press Win + . to open the emoji & symbol picker, then search.

macOS

2 options

Enable “Unicode Hex Input” in System Settings → Keyboard, then hold Option and type 2201.
Or: Control + Command + Space opens the Character Viewer — search by name.