Interrobang - interrogative (aka a question) + bang (type jargon for an exclamation point)
Interrobang fans can take heart, however; the sign is not so dead that it isn't in the Unicode standard. You can find it at U+203D.
If you have a browser macho enough to handle it:
‽
Addition 20 December 2003:
tetrisboy admits to having a pussy browser, so here we throw together an ASCII rendering of said character:
*****
*********
*** ****
** * ***
*** ***
*** ***
*** ***
******
****
***
***
*
***
*
In some fonts the top of the ! intersects the top of the ? but for clarity we're using a shortened bang.