The interabang or interrobang combines a question (?) and an exclamation (!). It asks an exciting question, expresses provocation and disbelief in the form of a question and a statement. For example:
You’ve never seen an episode of Scene to Seen‽
He said what‽
You call that a hat‽
What are those‽
It is known in the jargon of printers and programmers as a “bang”.