In reference to the saddle, there is what is commonly referred as a break angle, which is the angle of the string length from saddle to hole in relation to the "speaking" string length. But to prevent the saddle from prematurely wearing, the top of the saddle where the string rests usually has an angle shallower to some degree than that of the former - the "ramp" so to speak. This could occur at the nut as well.
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