Exactly that. I chose to refer to the root since I knew it can not be done 
But even powers are difficult. You wrote the square. OK, now how about
It is not so easy to do with Unicode. Keep also in mind that TeX has an accuracy in positioning glyphs which is less that 10^{-7} where Office apps usually are around 10^{-3}. The 2 raised to the 2 to the n can not be nicely done even with MSWord…