The phrase "inclination angle" refers to the angle at which something is tilted or slanted. It describes the degree to which something is not horizontal or vertical. Full definition
The pelvic inclination angle, which is the single most important element of human body posture, is mostly adjusted at the hips. (en.wikipedia.org)
In addition, there is the maximum fording depth of 1.20 m and a lateral inclination angle of up to 38 degrees. (mercedesblog.com)
Previous studies, led by Kenneth J. Lohmann of the University of North Carolina, had shown that hatchling loggerhead turtles can detect features of magnetic fields known as inclination angle and field intensity. (scientificamerican.com)