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⦠

spherical angle opening left

Spherical Angle Opening Left

⦠ is a spherical angle symbol turned so its opening faces left, a directional form of the usual spherical angle sign ∢. A spherical angle is the angle where two great-circle arcs meet on a sphere, the territory of spherical trigonometry. You meet it in math typesetting, not in everyday text.

Text symbol
Search it as
spherical angle · spherical angle symbol · angle symbol · geometry symbol · spherical trigonometry · U+29A0
Shows up in
Anything that takes text · its shape is whatever your font draws

What ⦠ means

A spherical angle sign, drawn opening to the left. On a sphere the shortest routes are great-circle arcs, like lines of longitude; where two meet, the angle between them is a spherical angle, measured in the plane touching the sphere at that point. ⦠ labels such an angle where the notation wants the sign facing left.

The term “spherical angle” is old: Merriam-Webster dates its first known use to 1678. The left-opening glyph is a typesetting variant that Unicode encodes next to its upward-opening sibling ⦡.

Fits technical mathematics and faithful transcription; in ordinary prose it looks cryptic.

Don't swap it for ∠ or ∢ unless the source uses this left-opening form.

Don't confuse it with

2
∢
Spherical Angle
The standard spherical angle sign; ⦠ is the same idea rotated to open left.
∠
Angle
The plain flat-geometry angle sign, with no arc; it does not mean a spherical angle.

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 29A0, 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 “spherical angle opening left”.
Linux
Ctrl+Shift+UType 29a0, then Enter or Space.
HTML
⦠
CSS
\29A0
Font support
If it shows as a box, switch to a math font; as of 2026, Cambria Math, Segoe UI Symbol, STIX Two Math and Unifont cover it.
Codes and encoding1 code points
HTML decimal
⦠
HTML hex
⦠
CSS content
content: "\29A0";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E2%A6%A0
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

1

Maths & numbers1,835 symbols

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