Default [Q] gyro and horizontal sensor calibration`?

Was searching old threads about it before posting and I just found this one: http://forum.xda-developers.com/show...1098912&page=3.

I just wanted to ask what are they for? Shall I touch something there? Now I am afraid... dont even wanna touch those options in my settings :P!! And first I just wanted to know what were they :P.

Thanksssss!