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⦹

circled perpendicular

Circled Perpendicular

⦹ marks perpendicularity inside a circle, but its shape alone does not specify a mathematical operation. In formulas, follow the writer’s notation to know exactly what it stands for.

Text symbol
Also called
operp · perpendicular in circle
Search it as
orthogonal sum · orthogonal direct sum · LaTeX obot
Shows up in
Anything that takes text · its shape is whatever your font draws

What ⦹ means

The circled perpendicular marks perpendicularity inside a circle. A MathML list (MathML is a web format for mathematical notation) glosses it as “perpendicular in circle.” That describes the shape; the surrounding formula and its author’s convention say what the sign stands for.

A 2011 post on LaTeX, a system for typesetting math, uses ⦹ for an orthogonal direct sum: combining spaces that are perpendicular to one another. That is one writer’s notation choice, not a standard definition.

Specialist math notation; the exact operation depends on the formula’s author.

Do not infer a standard operation from the shape alone.

Don't confuse it with

2
⊥
Up Tack
This is the plain perpendicular sign, without the enclosing circle.
⦷
Circled Parallel
This is circled parallel, with parallel strokes; ⦹ has the perpendicular mark.

Questions people ask

1

Why does ⦹ show as a box on some devices?

Because that device's fonts have no glyph for it. The character is still correct and still copies correctly — the box is a missing glyph, not a broken character.

How to type ⦹

Windows (Word)
Alt+XType 29B9, then Alt+X to get ⦹.
Windows
Win+Rrun charmap for the full table, or use the emoji picker's Ω symbols tab (Win + .).
macOS
Control+Command+SpaceOpen the character viewer and search “circled perpendicular”.
Linux
Ctrl+Shift+UType 29b9, then Enter or Space.
HTML
⦹
CSS
\29B9
LaTeX
A 2011 discussion suggests `\obot` from the `mathabx` package. The original poster says it changes the math font and conflicts with the `fourier` package.
Microsoft Word
Enter `29B9`, then press Alt+X to convert the hexadecimal code.
Codes and encoding1 code points
HTML decimal
⦹
HTML hex
⦹
CSS content
content: "\29B9";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E2%A6%B9
1
On screen
1
Code points
1
JS .length
3
UTF-8 bytes

A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.

Families this belongs to

2

Maths & numbers1,835 symbols

1️⃣📏📐✖️➕➖➗🟰♾️#️⃣*️⃣0️⃣

Shapes & colours597 symbols

🔴▶️🔵⭕⚫⚪▪️🔷🔹⏭️⏯️◀️