Angle sign

A small wedge open to the right, prefixing the name of an angle.

Also known as: Angle, Small wedge

MathematicalScientificStandard profile

Meanings

∠ marks what follows as an angle: ∠ABC names the angle at vertex B. It is a label rather than an operator, and the middle letter always names the vertex.

Officially standardisedVerified fact
Is encoded as U+2220 ANGLE in the Mathematical Operators block.
Contexts: Mathematics
Common modern usageVerified fact
Marks the letters that follow it as naming an angle, with the middle letter identifying the vertex: ∠ABC is the angle at B.
Contexts: Mathematics

Visual description

A horizontal stroke along the writing line meeting a shorter diagonal stroke rising to the right from its left-hand end, forming an acute corner that opens to the right.

Symmetry: none
Orientation: upright

Used alongside: Perpendicular sign
Perpendicularity is the statement that an angle is a right angle.
Used alongside: Degree sign
The angle is named with one and measured with the other.

Confidence

IdentityHigh confidence: High confidence because the identity is defined by a current official standard.
Historical originModerate confidence: Moderate confidence because the historical origin is documented in encyclopedic references, but early or supporting evidence is limited, but the regional or cultural match to this specific claim is not precise.
Current useHigh confidence: High confidence because the current use is defined by a current official standard.
Visual matchHigh confidence: High confidence because the visual match is documented in encyclopedic references.

Sources

Glossary of mathematical symbols
Wikipedia · retrieved 2026-07-31
Tertiary reference. Used for what the notation means in ordinary mathematical practice and for attribution of its introduction, not for a claim that any body defines it.
Unicode Code Chart: Mathematical Operators (U+2200–U+22FF)
The Unicode Consortium · retrieved 2026-07-30
Authoritative for the character's code point, name and block only. Unicode assigns identity; it does not define what a symbol means in use.

Last reviewed 2026-08-01

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Meanings

∠ marks what follows as an angle: ∠ABC names the angle at vertex B. It is a label rather than an operator, and the middle letter always names the vertex.

Officially standardisedVerified fact

Is encoded as U+2220 ANGLE in the Mathematical Operators block.

Contexts: Mathematics

Common modern usageVerified fact

Marks the letters that follow it as naming an angle, with the middle letter identifying the vertex: ∠ABC is the angle at B.

Contexts: Mathematics

Confidence

IdentityHigh confidence: High confidence because the identity is defined by a current official standard.
Historical originModerate confidence: Moderate confidence because the historical origin is documented in encyclopedic references, but early or supporting evidence is limited, but the regional or cultural match to this specific claim is not precise.
Current useHigh confidence: High confidence because the current use is defined by a current official standard.
Visual matchHigh confidence: High confidence because the visual match is documented in encyclopedic references.

Sources

Glossary of mathematical symbols
Wikipedia · retrieved 2026-07-31
Tertiary reference. Used for what the notation means in ordinary mathematical practice and for attribution of its introduction, not for a claim that any body defines it.
Unicode Code Chart: Mathematical Operators (U+2200–U+22FF)
The Unicode Consortium · retrieved 2026-07-30
Authoritative for the character's code point, name and block only. Unicode assigns identity; it does not define what a symbol means in use.

Last reviewed 2026-08-01

Meanings

Visual description

Related & commonly confused symbols

Meanings

Visual description

Related & commonly confused symbols