An angle which measures \[0{}^\circ \] is called?

Hint: In geometry, we can define that angle is a figure which is formed between and by two rays which are called as sides of angle or angle arms. These rays share a common vertex which is known as the vertex of the angle. Angle is also formed by two intersected planes. The figure below shows an angle.


Complete answer:
An angle which measures \[0{}^\circ \] is called a zero angle. If it is hard to imagine how an angle will look with\[0{}^\circ \]you can just visualize it as an angle which has value greater than\[0{}^\circ \]. Now fix one of those rays and rotate the other until it lies completely over the fixed ray. That’s when the angle is zero and it is known as a zero angle. In simple words you can just understand that zero angle is formed when both rays (angle arms) are in the same position. This can be seen in the diagram below

Hence, an angle which measures \[0{}^\circ \] is called a zero angle.

Note: As there is zero angle there are also other multiple types of angles according to degree measure. These angles are
Zero angle: Angle whose measure is \[0{}^\circ \].
Acute angle: Angle whose measure is less than \[90{}^\circ \].
Right angle: Angle whose measure is \[90{}^\circ \].
Obtuse angle: Angle whose measure is greater than \[90{}^\circ \]but less than \[180{}^\circ \].
Straight angle: Angle whose measure is \[180{}^\circ \].
Reflex angle: Angle whose measure is greater than \[180{}^\circ \] but still lesser than \[360{}^\circ \].
Angle whose degree measure is greater than that of another angle is the greater angle. That’s why on comparing there we can notice and see that
Zero angle < Acute angle < Right angle < Obtuse Angle < Straight angle < Reflex angle