查wikipedia:
Orz (also seen as Or2, on_, OTZ, OTL, STO, JTO, _no, _冂○, 囧rz, O7Z, _|7O
, Sto, O|ˉ|_, orz, and Jto) is an emoticon representing a kneeling or
bowing person, with the "o" being the head, the "r" being the arms and part
of the body, and the "z" being part of the body and the legs. This stick
figure represents failure and despair. It is also commonly used for
representing a great admiration (sometimes with an overtone of sarcasm) for
someone else's view or action.