9^9^9
what?
$${{\left({{\mathtt{9}}}^{{\mathtt{9}}}\right)}}^{{\mathtt{9}}} = {\mathtt{196\,627\,050\,475\,552\,913\,618\,075\,908\,526\,912\,116\,283\,103\,450\,944\,214\,766\,927\,315\,415\,537\,966\,391\,196\,809}}$$
8 sideways