Well, mc2 means matter and speed of light squared and pi is 3.141592654. I dont no what you mean by 'what does pi=mc2 mean' but i can work out the equation.
Matter=0.111 Speed of light=299792458 m/s mc2=0.111times299792458=29979.24580000 29979.24580000squared=898755154.753421 898755154.753421 If you divide 898755154.753421 bi 3.141592654 it equals=1. This means an unknown number-pi