Google Won't Tell Me What � Means

I recently tweeted this quandary of mine. What is �? If your computer setup doesn't show this character the same way I see it, � looks like:

____
|FF|
|FD|
----

Or something like that. Not a Google search*, nor a Yahoo! search, nor a Wikipedia search will tell me what � means, or even incorporate � in the search results. Actually, the Google search teases me with suggestions to go with �, such as "� character" and "� unicode." I guess it's a special Unicode character with some significant meaning. (*The Google search URL somehow transformed "�" into "�.")

Maybe I should let � slide, as some mysteries are better left unexplained.