角 ∠

The sign denoting in a mathematical notation a geometric figure is an 「angle」 (and it is itself). Example of use: ∠ABC = 45 °.

The angle is formed by two rays emanating from one point (the top of the corner). It is often indicated by three points, ∠ABC. Here B is a vertex, and A and C are points lying on different rays (sides of the angle). The corners are given the designation in Greek letters, for example, ∠α.

The angle value (angular measure) can be calculated in different ways: in degrees, radians, turns or grads. If both sides of the angle lie on the same line, then this angle is called unfolded and its value is 180 °.

符号 「角」 包含在 「数学运算符」 块的 「角度」 子块中，并在1993年作为Unicode版本1.1的一部分获得批准。