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A small wedge open to the right, prefixing the name of an angle.
Also known as: Angle, Small wedge
∠ 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.
Is encoded as U+2220 ANGLE in the Mathematical Operators block.
Contexts: Mathematics
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
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.
Perpendicularity is the statement that an angle is a right angle.
The angle is named with one and measured with the other.