N-Ary Circled Plus Operator Symbol

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

Symbol: ⨁
Unicode: U+2A01
HTML entity: ⨁
Category: Math Symbols

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82 of 96 in the math symbols collection

About the n-ary circled plus operator symbol

N-ary circled plus operator is a mathematical notation symbol shaped like a plus sign enclosed within a circle. It is used primarily in algebra and linear algebra to denote a direct sum operation, often applied to vector spaces, modules, or groups. The character represents the binary operation of forming a direct sum, which combines two algebraic structures into a larger one while preserving their individual identities.

This symbol appears in technical texts and academic papers dealing with abstract algebra, category theory, and related fields. Its enclosed design distinguishes it from the ordinary plus sign and from the similar-looking circled plus character used in other contexts, such as logic or computing.

How to type N-Ary Circled Plus Operator

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 2A01 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 2A01.
Or: Control + Command + Space opens the Character Viewer — search by name.