symbol of angle of inclination
It can be seen as the three-dimensional version of the polar coordinate system. The radial distance is also called the radius or radial coordinate. The polar angle may be called colatitude, zenith angle, normal angle, or inclination angle. The use of symbols and the order of the coordinates differs between sources. In one system frequently encountered in physics (r, Î¸, Ï) gives the radial distance, polar angle, and azimuthal angle, whereas in another system used in many mathematics books (r, Î¸, Ï) gives the radial distance, azimuthal angle, and polar angle.