Allahs shin
“Then Allah(swa) will come to them in a shape other than the one which they saw the first time, and he will say, I am your Lord and they will say, You are our Lord and none will speak to Him then but the prophets and then it will be said to them , “do you know any sign by which you can recognize him ? They will say, “The Shin”, and so Allah will then uncover His Shin whereupon every believer will prostrate before him and there will remain those who used to prostrated before Him just for showing off and for gaining good reputation, “
http://turntoislam.com/community/threads/allah-will-lay-bare-his-shin-on-the-day.93322/