Spherical Angle Opening Up Symbol
⦡ (U+29A1) denotes a spherical angle opening up in mathematical notation.
U+29A1
⦡ is a mathematical symbol with the Unicode code point U+29A1. It is commonly used in contexts that describe spherical angles or angle notation. This page helps you copy it correctly across fonts and platforms.
Spherical Angle Opening Up Symbol Meaning
⦡ (Unicode U+29A1) is named “SPHERICAL ANGLE OPENING UP.” In mathematical notation, it represents a spherical angle with an opening direction indicated by the glyph form. Symbols like this are typically used in geometry, spherical trigonometry, or technical writing where authors need an explicit spherical-angle marker rather than a generic angle character. Because it’s a dedicated Unicode character, using ⦡ directly (instead of approximations) improves consistency in documents, diagrams, and rendered web typography.
Common uses
- •Marking spherical angle regions in geometry notes or diagrams
- •Labeling variables or measurements in spherical trigonometry write-ups
- •Creating precise math layouts for educational content
- •Using as a typographic symbol in technical documentation
- •Formatting consistent notation in math-heavy presentations and slides
Examples
⦡ Spherical Angle Opening Up
- ⦡The spherical angle ⦡ is measured on the unit sphere.
- ⦡Let ⦡ denote the angle opening up in the given configuration.
- ⦡We compare ⦡ with the corresponding spherical angle indicator.
- ⦡In the diagram, ⦡ marks the selected spherical angle.
- ⦡The value associated with ⦡ is computed from the coordinates.
Variations
Ready to copy
Technical codes
| Unicode | U+29A1 | |
| HTML Entity | ⦡ | |
| HTML Code | ⦡ | |
| CSS | \29A1 | |
| Alt Code | Alt + 10657 | |
| Decimal | 10657 |
How to type Spherical Angle Opening Up Symbol (⦡)
On Windows
Hold Alt and type 10657 on the numeric keypad. In Word, type 29A1 then press Alt + X.
On Mac
Switch to the Unicode Hex Input keyboard, then hold Option and type 29A1. Or press Control + Command + Space and search.
On Linux
Press Control + Shift + U, type 29a1, then press Enter or Space.
Anywhere
Copy ⦡ with the button above and paste it wherever you need it — this works on every device and in every app, with no keyboard shortcut to remember.
FAQ
What is the Unicode for ⦡?
The Unicode code point for ⦡ is U+29A1.
How can I copy ⦡ into HTML?
Use the HTML entity: ⦡ (as provided for ⦡).
How do I include ⦡ in CSS?
You can use the CSS escape: \\29A1.
What does the “opening up” in its name refer to?
It refers to the glyph’s directional form that indicates the spherical angle opening up in mathematical notation.