The angle between the light ray and the normal (perpendicular) to the surface at the point of reflection.
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For a smooth surface, the angle of incidence is the same as the angle of reflection.
If a light ray is reflected from a flat mirror with a reflection angle of 55o then the angle of incidence was also 55o. When reflecting from a mirrored surface, the angle of incidence equals the angle of reflection.
The angle of the reflected ray with the normal line to the surface of the mirror is the same as the angle of incidence. Snell's law.
It works here in Georgia, if the surface is flat and smooth.
the angle of incidence is the initial ray angle and the angle of reflection is the reflected ray angle