Angle Symbol
In geometry, the angle symbol is used to denote an angle formed by three points. The middle point corresponds to the vertex at which the angle lies. Typically the angle symbol is used in an expression like this:
In plain language this means the angle is formed by the three points A, B, and C with the vertex at point B.
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Usage
Angle  Concept
An angle is defined as the amount of rotation between two rays. Angles are measured using degrees and radians. A full rotation in degrees is 360°. A full rotation in radians is approximately 6.283 radians or τ (tau) radians.
Angle  Notation
The notation for a symbol is a small symbol written in text, sometimes followed by three letters that correspond to a figure.