Probably an ad in a character set your browser doesn't support. Almost certainly an error. Are you surfing through a proxy? it might happen if you are having ads served for a different country than the one you're in.
Well, if its the way you are showing in the image then its got to be error of some sort because I can see an url below it.
No... I am not using any proxy... Here is another one. This might be Chinese. I am surfing from USA. Weird….